Term
| What does console.log do? |
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Definition
| Prints the desired string or number to the console |
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Term
| Programs may be thought of as being made up of two things: |
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Definition
1)data
2)operations that manipulate data |
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Term
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Definition
| Outputs the data type of the value that you are checking |
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Term
| Data type that must be in “” |
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Definition
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Term
| What happens when you use a comma in a number data type? |
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Definition
| Separates it as two different numbers |
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Term
| What two functions can you use to convert a data type? |
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Definition
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Term
| Two ways (3) to declare a variable: |
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Definition
Let: for changeable ones
Const: for immutable ones
(Var also works but shouldn’t be used) |
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Term
| What happens if you forget to use let or const? |
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Definition
| JavaScript sets it as Var |
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Term
| One or more characters that represent a computation (like addition) is called? (+, -, %) |
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Definition
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Term
| Values an operator work on are called? |
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Definition
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Term
Addition
Subtraction
Multiplication
Division
Operators: |
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Definition
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Term
| What is the modulus operator and what does it do? |
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Definition
%
The remainder operator returns the integer remainder of dividing two operands |
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Term
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Definition
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Term
Increments operator
Decrement operator |
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Definition
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Term
Order of operations:
PEDMAS |
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Definition
Parentheses
Exponentiation
Multiplication
Division
Addition
Subtraction |
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Term
| What does + operator do to strings? |
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Definition
| Pushed them together without spaces |
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Term
Assignment operators
Addition
Subtraction
Multiplication
Division |
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Definition
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Term
| How to load in readline -sync to your program: |
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Definition
Const input= require(‘readline-sync’);
Then
Let info= input.question(“question text”); |
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Term
| Never forget ; at the end of your line of code but why? |
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Definition
| That’s how you designate the end of the line |
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Term
| JavaScript data type for storing try and false values? |
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Definition
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Term
Boolean operators:
Equal
Not equal
Greater than
Less than
Greater/equal
Less/equal |
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Definition
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Term
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Definition
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Term
| Strict equality operator? |
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Definition
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Term
| Boolean expression built out of smaller Boolean expressions is called |
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Definition
| Compound Boolean expression |
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Term
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Definition
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Term
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Definition
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Term
| Boolean operator precedence? |
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Definition
Not !
Exponentiation **
Multiply/divide */
Add subtract +-
Comparison <=,>=,<,>
Equality ==,!==,==,!=
Logical and/or &&,|| |
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Term
| Most basic form of a conditional statement is? |
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Definition
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Term
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Definition
| If (Boolean condition) {code to execute if Boolean condition is met} |
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Term
| How to get even numbers with Boolean if statement: |
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Definition
| If (variable % 2 === 0){} |
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Term
| How to get odd number from Boolean if statement: |
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Definition
| If (variable % 2 === 1) {} |
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Term
| What do you pair with an if statement to specify code to execute if Boolean condition is false |
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Definition
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Term
| These statements allow us to construct two alternatives paths of an if statement: |
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Definition
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Term
| How to write code with more complex branching behavior by combining conditionals? |
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Definition
| Nesting conditionals: putting an if statement in another if statement. If this is true then check if this is true. |
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Term
| Tracking down errors and fixing them in a program is called what? |
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Definition
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Term
| Error types and what they are: |
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Definition
Syntax-essentially a typo
Runtime- error that occurs when the program tries to run
Logic- program runs but doesn’t do what is expected |
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Term
| More error types: name all 6 from book |
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Definition
Syntax : missing () or similar
Reference:non existing variable is used
TypeError using a value in an invalid way
RangeError-passing an invalid value to a function
URIError improperly using a global URI-handling function
Error: type all others are built from |
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Term
| What is index of a string or array? |
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Definition
| The position of the specific character (or item in an array) starting from 0-end of data type |
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Term
| What is a collection of related data and operations? |
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Definition
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Term
| A piece of data associated with an object? |
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Definition
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Term
| An operation that can be carried out on an object? |
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
| Returns the index of a character in a string |
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Term
| To make a string all caps or all lower case? |
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Definition
toLowerCase()
toUpperCase() |
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Term
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Definition
| Removes all leading and trailing white space (empty spaces) |
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Term
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Definition
.replace(example,example)
Returns a copy of the string with the first occurrence of that character replaced by new character |
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Term
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Definition
.slice(i,j)
Returns the substring consisting of characters from index i to j-1 |
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Term
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Definition
| Tab and return for your string |
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Term
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Definition
(Uses back ticks)
(‘${variable} is called on with the ${}’) |
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Term
To declare a string
To declare an array |
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Definition
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Term
| A sequence of values that can be accessed via an ordered index. Uses , to separate values |
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Definition
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Term
| Can an array hold strings AND numbers? |
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Definition
| Yes both at the same time too |
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Term
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Definition
ArrayName.includes(item)
Checks array for specified item |
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Term
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Definition
Arr.indexOf(item)
Returns the index of the first occurrence of that item. -1 will show if it is not in the array |
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Term
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Definition
Are.reverse()
Reverses the array |
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Term
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Definition
Are.sort()
Alphabetized it into numbers first then cap letters then lower case letters. Does numbers in same way you alphabetize words |
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Term
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Definition
Are.pop()
Removes and returns the last element of an array |
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Term
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Definition
Arr.push(item1,item2,...)
Adds one or more items to the end of an array |
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Term
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Definition
Arr.shift()
Removes and returns first element of an array |
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Term
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Definition
Arr.splice(index,number,item1,item2)
Adds removes or replaces one or more elements in an array |
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Term
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Definition
Arr.unshift(item1,item,2...)
Adds one or more items to the start of an array and returns the new length |
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Term
| Array methods that create new arrays(4) |
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Definition
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Term
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Definition
Arr.concat(array1,array2,...)
Combines two or more arrays and returns the new array |
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Term
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Definition
Arr.join(“connector”)
Joins all elements of an array into a string on the connector item |
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Term
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Definition
Arr.slice(start index, end index)
Copies selected entries and puts them into a new array (think copy paste) |
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Term
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Definition
Arr.split(“delimiter”)
Divides string into smaller pieces which are stored into an array. Turns a string into an array |
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Term
| How to access items in a multidimensional array (an array of arrays) |
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Definition
| Array[index of first item][index of second item] |
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Term
| A repeated execution of a sequence of statements is called? |
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Definition
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Term
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Definition
For(let i=0; i < some value; i++) {
Code to execute across the array;
} |
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Term
| Difference between for and while loops? |
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Definition
For is for definite iteration when we know when it will end
While is for when we don’t know how long it will go for |
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Term
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Definition
For (initial expression; loop condition; update expression) {
Loop body
} |
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Term
| How do you check if your code is doing what you want in the background? |
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Definition
| Use console.log to print and see |
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Term
| A loop that will continue as long as it’s Boolean expression remains true? |
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Definition
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Term
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Definition
while (Boolean condition) {
Code to execute
} |
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Term
| How to forcibly terminate a loop? |
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Definition
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Term
| How to format a loop break: |
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Definition
if (condition to be met) {
break;
} |
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Term
| A reusable callable piece of code? |
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Definition
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Term
| The act of using a function by referring to its name? |
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Definition
Function call
Function invocation(invoking a function) |
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Term
| Creating a Function format: |
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Definition
Function functionName(argument1,argument2,....) {
Function body
} |
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Term
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Definition
function myFunction (parameters of function separates by ,) {
Function body
} |
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Term
| A function will only execute when? |
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Definition
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Term
| These take inputs and return outputs |
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Definition
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Term
| Proper syntax for return in a function |
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Definition
return (what will be returned)
}
Must be inside the Curley brackets |
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Term
NaN
What is it and how to use it? |
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Definition
Not a number
isNaN will use Boolean expression of if it is true that it is not a number |
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Term
| Is using a return in a function required in all functions? |
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Definition
| No it is optional. But I’d not used it will return nothing out of it. |
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Term
| What terminated a function execution? |
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Definition
return
Don’t write anything after it in the function or it won’t work |
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Term
| How can you use return more than once in a function? |
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Definition
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Term
| Function parameter vs argument: |
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Definition
Parameter is what is in the functionName (parameter) when declaring a function
Argument is what is put in the parameter () when calling the function for use |
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Term
| Good function writing process: 3 steps |
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Definition
1-design your function: consider what your function will do
2- create a basic structure-use proper format
3- write the body- alternate between sub-tasks and running your code |
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Term
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Definition
| You can’t use a variable that hasn’t been defined yet do this first before using it in a loop/if else statement within the function |
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Term
| What is camel case format? |
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Definition
camelCase
lowerStartButEachWordStartsCapNext |
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Term
| Things for Good function naming: 3 things |
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Definition
Use camelCase
Use verb/noun pairs ex:fillFuelTank
Use descriptive names: ex: convertInchToFeet |
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Term
| How many things should a function do? Ultimate goal of function? |
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Definition
| Should do one thing. Even if it takes multiple steps it should accomplish one task |
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Term
| How to write an anonymous function variable. Syntax correct |
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Definition
let variableName = function(parameter1,para2,...) {
Body
}; |
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Term
Using a function in another function format.
Passing a function |
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Definition
| function1Name (function2Name(parameters of function 2)); |
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Term
| What the array method map does |
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Definition
Arr.map(parameters)
Runs the function on all items in an array
Ex:arr.map(*3) would multiply all items in an array by 3
Creates a new array doesn’t alter the original |
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Term
| Process of solving a larger problem by breaking it into smaller pieces that can be solved in the exact same way: |
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Definition
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Term
| Recursion with functions is? |
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Definition
| Using a function in another function so as to keep each function DRY and performing only one task |
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Term
| In order to function recursion must fulfill four conditions: |
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Definition
1-series of small identical steps combine to solve a larger problem
2-base case must be defined
3-recursive function repeatedly calls itself
4-each time the recursive function is called it must alter the data/variables/conditions |
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Term
| Each object contains what pairs? |
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Definition
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Term
|
Definition
Basically a category name
And the value is the item in that category. Example:
Name: students name |
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Term
| Initializing an object: syntax used |
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Definition
let objectName = {
key1:value1
key2:value2
Etc...
}; |
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Term
| What is a property of an object? |
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Definition
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Term
| How to call a key/value from an object: |
|
Definition
objectName.keyName
Or
objectName[“keyName”] |
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Term
| Should I use . Or [] to call an object key/value? |
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Definition
| [] bc sometimes . Won’t work. Avoid confusion by using [] consistently |
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Term
| Modify object properties syntax: |
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Definition
ObjectName[“keyName”] = newValue;
This also works for defining a new key/value pair for an object |
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Term
| Can objects use functions? |
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Definition
| Yes it can be the value of a key/value pair |
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Term
| Can two identical objects be Boolean true (===) what about a key/value pair within two objects? |
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Definition
No two objects will always be false
value of an object CAN be true if they are identical |
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Term
| How do you iterate through an object? |
|
Definition
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Term
|
Definition
for (item*** in objectName) {
Code to execute;
}
***this is same as i in a for loop it can be called whatever |
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Term
| How to use Pi in JavaScript? |
|
Definition
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Term
|
Definition
Math.abs(number)
Returns the positive value of number |
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Term
|
Definition
Math.ceil(number)
Rounds the decimal number UP to the closest integer value |
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Term
|
Definition
Math.floor(number)
Rounds decimal DOWN to closest number (no decimals at all) |
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Term
|
Definition
Math.max(x,y,z....)
Returns the largest value from a set of numbers |
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Term
|
Definition
Math.min(x,y,z,....)
Returns smallest value from a set of numbers |
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Term
|
Definition
Math.pow(x,y)
Gives you the value of X to the power of Y |
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Term
|
Definition
| Math.random() returns a random number between 0 and 1 NOT including 1 |
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Term
|
Definition
Math.round(number)
Rounds a number to the closest integer value (.5 or higher rounds up .4999999999 or lower rounds down) |
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Term
|
Definition
Math.sqrt(number)
Gives the square root of a number |
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Term
|
Definition
Math.trunc(number)
Removes any decimals and returns the integer part of number |
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Term
| Rounding to decimal places: |
|
Definition
Math.round(number with decimals*100)/100
However many 0s in that (100, 1000, 100,000) is how many decimal places you are rounding two. So 100 gives two decimal places for example. |
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Term
|
Definition
|
|
Term
Syntax to export your module:
Just one function |
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Definition
| module.exports = functionName; |
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Term
| Syntax to export multiple modules. Remember this must go at the bottom of your code |
|
Definition
module.exports = {
function1Name: function1Name
function2Name: function2Name
Notice this is similar:to objects
... etc
} |
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Term
| Syntax to import a module: |
|
Definition
Uses apostrophe
const jasmine = require(‘../file name.js’); |
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Term
| Syntax for loading jasmine for unit testing |
|
Definition
const Jasmine = require(‘jasmine’);
const jasmine = new Jasmine();
jasmine.loadConfig({
spec_dir: ‘spec’,
spec_files: [
“**/*[sS]pecjs”
],
});
jasmine.execute(); |
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Term
| Unit testing syntax and format |
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Definition
describe(“describe function”, function(){
it(“description of test performed”, function(){
expect(functionNameToTest(parameters)).toEqual(“thing to be tested against)
Doesn’t have to be toEqual can be whatever is tested |
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Term
| Three types of testing to consider: |
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Definition
Positive: verifies expected behavior with valid data
Negative: verifies expected behavior with invalid date
Edge case: subset of positive tests which check the extreme edges of valid values (ex 1-100 edge would be 1 and 100) |
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