How To Use Javascript Arrow Functions & This Keyword?

Arrow functions are a new feature of JavaScript that allows us to define functions locally within the current scope. This is similar to block scopes in other languages, but instead of defining variables as part of a parent function and destroying them at the end of the function.

arrow function javascript

By Kumaran KMKumaran KM on May 22, 2021
// Normal Function in JavaScript
function Welcome(){
  console.log("Normal function");
}

// Arrow Function
const Welcome = () => {
  console.log("Normal function");
}

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5

arrow function javascript

By AntoniotonioAntoniotonio on Sep 11, 2020
const suma = (num1, num2) => num1+num2
console.log(suma(2,3));
//5

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3

arrow function javascript

By Code_BreakerCode_Breaker on Dec 07, 2020
//If body has single statement
let myFunction = (arg1, arg2, ...argN) => expression

//for multiple statement
let myFunction = (arg1, arg2, ...argN) => {
    statement(s)
}
//example
let hello = (arg1,arg2) => "Hello " + arg1 + " Welcome To "+ arg2;
console.log(hello("User","Grepper"))
//Start checking js code on chrome inspect option

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20

arrow function javascript

By Cheerful CormorantCheerful Cormorant on Jan 26, 2021
// An empty arrow function returns undefined
let empty = () => {};

(() => 'foobar')();
// Returns "foobar"
// (this is an Immediately Invoked Function Expression)

var simple = a => a > 15 ? 15 : a;
simple(16); // 15
simple(10); // 10

let max = (a, b) => a > b ? a : b;

// Easy array filtering, mapping, ...

var arr = [5, 6, 13, 0, 1, 18, 23];

var sum = arr.reduce((a, b) => a + b);
// 66

var even = arr.filter(v => v % 2 == 0);
// [6, 0, 18]

var double = arr.map(v => v * 2);
// [10, 12, 26, 0, 2, 36, 46]

// More concise promise chains
promise.then(a => {
  // ...
}).then(b => {
  // ...
});

// Parameterless arrow functions that are visually easier to parse
setTimeout( () => {
  console.log('I happen sooner');
  setTimeout( () => {
    // deeper code
    console.log('I happen later');
  }, 1);
}, 1);

Source: developer.mozilla.org

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0

arrow function javascript

By TigerYTTigerYT on Dec 30, 2020
/* Answer to: "arrow function javascript" */

// Single-line:
let testingFunc(string) => string == "Test" ? "Success!" : "Failure!";
console.log(testingFunc("test")); // "Failure!"

// Multi-line:
let arrowFunc(string) => {
  if (string = "test") {
    return "Success!";
  }
    return "Failure!";
  }
};
console.log(testingFunc("Test")); // "Success!"

/*
  Arrow functions in JavaScript are like regular functions except they look
  look nicer (imo) and there's single-line version of it which implicitly
  returns.
  
  Here's a guide showing the differences between the two:
  https://medium.com/better-programming/difference-between-regular-functions-and-arrow-functions-f65639aba256
  > The link will also be in the source below.
*/

Source: medium.com

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0

arrow function javascript

By Dangerous DuckDangerous Duck on Jun 04, 2021
///////
//JavaScript Function Declarations
///////

//4th (arrow function)
hello4 = (name) => { return ("Hello " + name); }
    //OR
hello5 = (name) => { return (`Hello new ${name}`) }

//1st (simple function)
function hello1() {
    return "Hello simple function";
}

//2nd (functino expression)
hello2 = function() {
    return "Hello functino expression";
}

// 3rd ( IMMEDIATELY INVOKED FUNCTION EXPRESSIONS (llFE))
hello3 = (function() {
    return "Hello IMMEDIATELY INVOKED FUNCTION EXPRESSIONS (llFE)";
}())

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0

arrow function javascript

By peachmangopiepeachmangopie on Dec 03, 2020
// an arrow function is also called a lambda or an anonymous function

let myFunction = () => {
  // some logic
}

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0

arrow function javascript

By Cheerful CormorantCheerful Cormorant on Jan 26, 2021
// Traditional Function
function bob (a){
  return a + 100;
}

// Arrow Function
let bob = a => a + 100;

Source: developer.mozilla.org

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0

arrow function javascript

By Cheerful CormorantCheerful Cormorant on Jan 26, 2021
([a, b] = [10, 20]) => a + b;  // result is 30
({ a, b } = { a: 10, b: 20 }) => a + b; // result is 30

Source: developer.mozilla.org

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0

arrow function javascript

By Cheerful CormorantCheerful Cormorant on Jan 26, 2021
// Traditional Function
function (a, b){
  let chuck = 42;
  return a + b + chuck;
}

// Arrow Function
(a, b) => {
  let chuck = 42;
  return a + b + chuck;
}

Source: developer.mozilla.org

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0

They are defined inline within their own scope and then destroyed when the function terminates.

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