Youtor
JavaScript forEach method in 8 minutes ➿
YOUR LINK HERE:
http://youtube.com/watch?v=uOZWH0KEUs4
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); • } • */
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