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Applying a custom function to each corresponding element of two arrays using JavaScript
Problem
We are required to write a JavaScript function that takes in a callback function (which takes in two arguments and returns a value) as the first argument and two arrays of essentially the same length as the second and third argument.
Our function should construct and return a new array whose each corresponding element is the return value of the callback function if corresponding numbers of the input array are provided to it.
Example
Following is the code −
const arr1 = [1, 2, 3, 4]; const arr2 = [5, 6, 7, 8]; const add = (a, b) => a + b; const applyFunction = (callback = () => {}, arr1 = [], arr2 = []) => { const res = []; arr1.forEach((num1, ind) => { const num2 = arr2[ind]; res.push(callback(num1, num2)); }); return res; }; console.log(applyFunction(add, arr1, arr2));
Output
[6, 8, 10, 12]
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