javascript.md

JavaScript Quick Syntax Reference

• array
• arrow function
• bracket notation
• class
• const
• dot notation
• filter
• find
• for
• forEach
• for...in
• for...of
• function
• get
• if
• if...else
• if...else if
• instance
• let
• loop
• object literal
• return
• switch
• ternary
• var
• while

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array

var myArray = [element1, element2, element3];

var myArray = new Array();

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JavaScript Loops, Arrays, and Objects - What is an Array?

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Practice Basic Arrays in JavaScript

arrow function

const addNumToTen = num => 10 + num;

const divideNumbers = (num1, num2) => num1/num2;

const printMyName = () => {
    const myName = 'Ashley';
    console.log(myName);
}

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Introducing Arrow Function Syntax
Getting Started with ES2015 - Basic Arrow Syntax
Introducing ES2015 - Arrow Functions

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Practice Arrow Functions in JavaScript on Treehouse

See also

function

bracket notation

object['propertyKey']
object['methodName']()

var propertyKey = 'name'
object[propertyKey] 

array[indexOfElement]

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JavaScript Loops, Arrays, and Objects - Accessing Object Properties
Object-Oriented JavaScript - Dot Notation and Bracket Notation

See also

dot notation

class

class Fruit {

}

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Introducing ES2015 - Structure of Class
Object-Oriented JavaScript - Writing Your First Class

See also

instance

const

const myString = 'Hello World';

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Defining Variables with Let and Const
Introducing ES2015 - Let and Const
Getting Started with ES2015 - Declaring Variables in JavaScript

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Practice Let and Const in JavaScript on Treehouse

See also

var
let

dot notation

object.propertyKey
object.methodName()

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JavaScript Loops, Arrays, and Objects - Accessing Object Properties
Object-Oriented JavaScript - Dot Notation and Bracket Notation

See also

bracket notation

filter

array.filter(element => <condition>);

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Array Iteration Methods - Remove Array Items with Filter

find

array.find(element => <condition>);

for

for (let i = 0; i <= 10; i++){
    console.log(i);
}

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JavaScript Loops, Arrays, and Objects - For Loops

See also

forEach
for...in
for...of

forEach

myArray.forEach(function(elem){
    console.log(elem);
});

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JavaScript Array Iteration - for vs forEach

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Practice forEach in JavaScript

for...in

for (property in object) {
    console.log(`Key: ${prop}`); 
    console.log(`Value: ${object[prop]}`); 
}

See also

for
for...of

for...of

for (element of iterable) {
    console.log(element)
}

See also

for...in
for

function

function myFunc(param) {
    console.log(param);
}

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JavaScript Basics - Introducing Functions

Practice on Treehouse

Practice Basic JavaScript Functions

See also

arrow functions

get

get myDynamicProperty(){
	return dynamicProperty;
}

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Object-Oriented JavaScript - Getters

if

if (x == y) {
    console.log(true);
}

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JavaScript Basics - Introducing Conditional Statements

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Practice If and Else If Statements in JavaScript

See also

conditional
if else
if...else if
switch
ternary

if...else

if (x == y) {
    console.log(true);
} else (
    console.log(false);
)

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Practice If and Else If Statements in JavaScript

See also

conditional
if
if...else if
switch
ternary

if...else if

if (x == y) {
    console.log(true);
} else if (x == j) (
    console.log(true);
) else {
    console.log(false);
}

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Practice If and Else If Statements in JavaScript

See also

conditional
if
if...else
switch
ternary

instance

var banana = new Fruit();

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Object Oriented JavaScript - Instantiating a Pet Object

See also

class

let

let myString = 'Hello World';

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Defining Variables with Let and Const Introducing ES2015 - Let and Const Getting Started with ES2015 - Declaring Variables in JavaScript

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Practice Let and Const in JavaScript on Treehouse

See also

const
var

loop

See also

for
for...in
for...of
while

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JavaScript Loops, Arrays, and Objects - What are loops?

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Practice JavaScript Loops

object literal

var object = {
    property1: "value1",
    property2: "value2",
    method1: function(){}
}

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JavaScript Loops, Arrays, and Objects - The Object Literal
Object-Oriented JavaScript - Object Literals and Components of Objects

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Practice Object Literals in JavaScript on Treehouse

return

return x;

switch

switch (x) {
    case 1:
        console.log(1);
        break;
    case 2:
        console.log(2);
        break;
    case 3: 
        console.log(3);
        break;
}

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Exploring JavaScript Conditionals - Switch Statement

See also

conditional
if
if...else
if...else if
ternary

ternary

<condition> ? <code if true> : <code if false>;

x == y ? console.log('true') : console.log('false');

var val = x == y ? true : false;

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Exploring JavaScript Conditionals - Ternary Operator

See also

conditional
if
if...else
if...else if
switch

var

var myString = 'Hello World';

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JavaScript Basics - Introducing Variables

Practice on Treehouse

Practice Basic Variables, Input, and Output in JavaScript

See also

const
let

while

while (i < 10) {
    i++;
}

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Javascript Loops, Arrays, and Objects - What are Loops?