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What are the 3 variables?

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JavaScript Web Dev

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Mar 1, 2020

Cards (44)

Section 1

(44 cards)

What are the 3 variables?

Front

var, let and const

Back

function

Front

reusable block of code that groups together a sequence of statements to perform a specific task.

Back

>=

Front

greater than or equal to

Back

Write a template literal:

Front

` ${} `

Back

conditional statement

Front

conditional statement checks specific condition(s) and performs a task based on the condition(s)

Back

var

Front

JS keyword for variable, creates/declares new variable

Back

Boolean

Front

This data type only has two possible values— either true or false (without quotes).

Back

multi-line comment (block comment)

Front

starts with / and ends with /, where all text between / and / is part of the comment

Back

ternary operator

Front

shorthand to simplify concise if...else statements.

Back

Undefined

Front

This data type is denoted by the keyword undefined (without quotes). It also represents the absence of a value though it has a different use than null.

Back

Variable

Front

a container for a value

Back

List 2 types of code comments in JavaScript:

Front

single line comment and multi-line comment

Back

/ /

Front

multi-line comment

Back

Fat Arrow

Front

() =>

Back

Operator

Front

a character that performs a task in our code

Back

Symbol

Front

unique identifiers, useful in more complex coding

Back

Console

Front

an object, a collection of data and actions, that we can use in our code.

Back

What are the seven fundamental data types in Javascript?

Front

Number, String, Boolean, Null, Undefined, Symbol, Object

Back

Object

Front

Collections of related data.

Back

typeof

Front

Returns the data type value

Back

single line comment

Front

will comment out a single line and is denoted with two forward slashes // preceding it

Back

Multi-line Comment

Front

Will comment out multiple lines and is denoted with / to begin the comment, and / to end the comment. You can also use this syntax to comment something out in the middle of a line of code.

Back

.

Front

The dot operator

Back

A single line comment begins with:

Front

Two forward slashes ( // )

Back

When can a value be falsy:

Front

0, Empty strings like "" or '', null (which represent when there is no value at all) undefined (which represent when a declared variable lacks a value), NaN (Not a Number)

Back

3 logical operators

Front

and (&&) or (||) and not (bang !)

Back

How to start a JS doc:

Front

main.js

Back

How do we call, or use methods?

Front

ie. 'example string'.methodName()

Back

!==

Front

is NOT equal to

Back

List the arithmetic operators:

Front

+, -, *, /, %

Back

String

Front

Any grouping of characters on your keyboard (letters, numbers, spaces, symbols, etc.) surrounded by single quotes: ' ... ' or double quotes " ... ". Though we prefer single quotes. Some people like to think of string as a fancy word for text.

Back

<

Front

Less than

Back

modulo

Front

%. Returns the remainder from a division.

Back

<=

Front

less than or equal to

Back

Concatenation

Front

This process of appending one string to another

Back

Parameter of a function

Front

function ==>(this)<== { } . - To allow a function to accept data. provides the information the function needs to perform its job, e.g., how long should the phone vibrate, or how big a circle should be drawn

Back

Number

Front

Any number, including numbers with decimals: 4, 8, 1516, 23.42

Back

data type

Front

classifications we give to the different kinds of data that we use in programming

Back

Write correct 'if' syntax:

Front

if (true or false) { // block statement }

Back

>

Front

greater than

Back

Null

Front

This data type represents the intentional absence of a value, and is represented by the keyword null (without quotes).

Back

===

Front

equal to

Back

//

Front

start of single line comment

Back

function declaration syntax

Front

function idOfFunction ( ) { }

Back