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Functions in JS Cheat Sheet by

Functions in JS as arrows

Regular Functions

function f(){
        //returns undefined
      }
Function regular sin retorno

Regular function with return keyword.

function f(){
        return true;
      }

Single parameter and return value

function f(name){
        return name.toUpperCase();
      }

Multiple parameters and default values.

function f(isAlive=true, department=42){
        return true;
      }

IIFE that accepts parameters

(function f(name, message){
        console.log(
${name} says ${message}
);
      })('Sheldon', 'Bazinga');

function returning an object

function f(){
        return {
          id: 123,
          name: 'Steve'
        }
      }

function f(){
          return (
            {
              id: 123,
              name: 'Steve'
            }
          )
        }

Destru­cturing an object as a parameter

 function f({id, name}){
        //id and name are now local variables inside this function
      }

      let myObj = {
        id: 123,
        name: 'Steve'
      }
      f(myObj);
 

Arrow functions

const f = () =>{
        //returns undefined
      }
Arrow sin retorno

Arrow function with return keyword

const f = () => {
        return true;
      }

const f = () => true;

Single parameter and return value

const f = name => {
        return name.toUpperCase();
      }

const f = name => name.toUpperCase();

Multiple parameters and default values.

const f = (isAlive=true, department=42) => true;

Arrow IIFE that accepts parameters

((name, message)=>{
        console.log(
${name} says ${message}
);
      })('Sheldon', 'Bazinga');

Arrow function returning an object.

const f = () =>{
          return {
            id: 123,
            name: 'Steve'
          }
        }

 const f = () =>( { id: 123, name: 'Steve' } );

Arrow destru­cturing an object as a parameter

const f = ({id, name}) =>{
        //id and name are now local variables inside this function
      }

      let myObj = {
        id: 123,
        name: 'Steve'
      }
      f(myObj);
 

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