Скачать с ютуб JavaScript forEach() method in 8 minutes! ➿ в хорошем качестве

JavaScript forEach() method in 8 minutes! ➿

00:00:00 introduction 00:00:18 example 1 00:03:58 example 2 00:07:37 conclusion // forEach() = method used to iterate over the elements // of an array and apply a specified function (callback) // to each element // array.forEach(callback) // element, index, array are provided // ------------- EXAMPLE 1 ------------- const numbers = [1, 2, 3, 4, 5]; numbers.forEach(cube); numbers.forEach(display); function double(element, index, array){ array[index] = element * 2; } function triple(element, index, array){ array[index] = element * 3; } function square(element, index, array){ array[index] = Math.pow(element, 2); } function cube(element, index, array){ array[index] = Math.pow(element, 3); } function display(element){ console.log(element); } // ------------- EXAMPLE 2 ------------- let fruits = ["apple", "orange", "banana", "coconut"]; fruits.forEach(capitalize); fruits.forEach(display); function upperCase(element, index, array){ array[index] = element.toUpperCase(); } function lowercase(element, index, array){ array[index] = element.toLowerCase(); } function capitalize(element, index, array){ array[index] = element.charAt(0).toUpperCase() + element.slice(1); } /* function display(element){ console.log(element); } */