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javascript callback functions
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| //callback | |
| const callback1 = (n) => { | |
| return n ** 2; | |
| }; | |
| function cube(callback, n) { | |
| return callback1(n) * n; | |
| } | |
| //returning functions | |
| const highOrder = (n) => { | |
| const doSomeThing = (m) => { | |
| const doWhatEver = (t) => { | |
| return 2 * n + 3 * m + t; | |
| }; | |
| return doWhatEver; | |
| }; | |
| return doSomeThing; | |
| }; | |
| console.log(highOrder(2)(3)(10)); | |
| //returning function with callback | |
| const numbers = [1, 2, 3, 4]; | |
| const sumArray = (arr) => { | |
| let sum = 0; | |
| const callBack = function (element) { | |
| sum += element; | |
| }; | |
| arr.forEach(callBack); | |
| return sum; | |
| }; | |
| console.log(sumArray(numbers)) | |
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