JSFiddle - React, Tailwind, and code Playground

by Jessie Lau

JavaScript

function each(array, action){
    for(var i = 0; i < array.length; i++){
        array[i]= action(array[i]); //change the ariginal array 
    }   
}

function f2(num){
    return num*2;
}

function f3(num){
    return num*10;
}

function f4(num){
    return num + "x";
}

var myArr = [3,4,5,6];
//each(myArr,f4);
each([3,4,5,6], function(num){return num + "x";});
console.log(myArr);