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Alternatingly combining array elements in JavaScript
Problem
We are required to write a JavaScript function that takes in any number of arrays of literals as input.
Our function should prepare a new array that contains elements picked alternatingly from all the input arrays.
For example, if the input to the function is −
Input
const arr1 = [1, 2, 3, 4]; const arr2 = [11, 12, 13, 14]; const arr3 = ['a', 'b', 'c'];
Output
const output = [1, 11, 'a', 2, 12, 'b', 3, 13, 'c', 4, 14];
Example
Following is the code −
const arr1 = [1, 2, 3, 4];
const arr2 = [11, 12, 13, 14];
const arr3 = ['a', 'b', 'c'];
const pickElements = (...arrs) => {
const res = [];
const max = Math.max(...arrs.map(el => el.length));
for(let i = 0; i < max; i++){
for (let j = 0; j < arrs.length; j++){
if(arrs[j][i]){
res.push(arrs[j][i]);
}
};
};
return res;
};
console.log(pickElements(arr1, arr2, arr3));Output
[ 1, 11, 'a', 2, 12, 'b', 3, 13, 'c', 4, 14 ]
Updated on: 22-Apr-2021
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