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Javascript Functions Quick References

#javascript #cheatsheet

JavaScript Functions Cheat Sheet

Function Declaration

Syntax 

function functionName(parameters) { // Function body return result; }
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Example 

function greet(name) { return `Hello, ${name}!`; } console.log(greet('World'));
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Function Expression

Syntax 

const functionName = function(parameters) { // Function body return result; };
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Example 

const greet = function(name) { return `Hello, ${name}!`; }; console.log(greet('World'));
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Arrow Function

Syntax 

const functionName = (parameters) => { // Function body return result; };
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Example 

const greet = (name) => `Hello, ${name}!`; console.log(greet('World'));
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Immediately Invoked Function Expression (IIFE)

Syntax 

(function() { // Function body })();
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Example 

(function() { console.log('IIFE executed'); })();
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Function Parameters and Arguments

Example 

function addNumbers(a, b) { return a + b; } console.log(addNumbers(5, 10)); // Output: 15
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More: Javascript Cheat Sheet

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