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Javascript Cheatsheet ⚡️

💻 JavaScript Basics

- On Page Script

<script type="text/javascript">

- External JS File

<script src="filename.js"></script>

💻 Functions

function nameOfFunction() {
// function body
}


💻 DOM Element

document.getElementById("elementID").innerHTML = "Hello World!";

💻 Output

console.log(a);

💻Conditional Statements

- If Statement

if (condition) {
// block of code to be executed if the condition is true
}

- If-else Statement

if (condition) {
// block of code to be executed if the condition is true
} else {
// if the condition is false
}

💻 Switch Statement

switch (expression) {
case x:
// code block
break;
case y:
// code block
break;
default:
// code block
}

💻 For Loop

for (initialization; condition; incrementation;) {
// code block to be executed
}


💻 While Loop

while (condition) {
// code block to be executed
}

Do While Loop

do {
// run this code in block
i++;
} while (condition);

💻 Strings

- charAt method

str.charAt(3)

- concat method

str1.concat(str2)

- index of method

str.indexOf('substr')

- match method

str.match(/(chapter \d+(\.\d)*)/i;)

- replace method

str1.replace(str2)

- split method

str.split('\n')

Arrays

var fruit = ["element1", "element2", "element3"];

- concat method

concat()

- indexOf method

indexOf()

- join method

join()

- reverse method

reverse()

- sort method

sort()

- toString method

toString()

- valueOf method

valueOf()

💻 Dates

- Pulling Date from the Date object

getDate()

- Pulling Day from the Day object

getDay()

- minutes

getMinutes()

- Hours

getHours()

- Seconds

getSeconds()

- Time

getTime()

💻 Errors

- try and catch

try {
Block of code to try
}
catch (err) {
Block of code to handle errors
}

- alert method

alert()

- blur method

blur()

- setInterval

setInterval(() => {
// Code to be executed
}, 1000);

- setTimeout

setTimeout(() => {
// Code to be executed
}, 1000);

- close

window.close()

- confirm

window.confirm('Are you sure?')

- prompt

var name = prompt("What is your name?", "LEARN JAVASCRIPT");


- querySelector

document.querySelector('css-selectors')document.getElementsByTagName('element-name')

- querySelectorAll

document.querySelectorAll('css-selectors', ...)

- getElementsByTagName

document.getElementsByTagName('element-name')

- getElementsByClassName

document.getElementsByClassName('class-name')

- Get Element by Id

document.getElementById('id')

- createElement

document.createElement('div')

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