how to solve targetArrayInGivenOrder in JavaScript-CodePudding

Write a function that takes two arrays of integers (nums and index) and returns a target array under the following rules: Initially target array is empty. From left to right read nums[i] and index[i], insert at index index[i] the value nums[i] in target array. Repeat the previous step until there are no elements to read in nums and index.

Example 1 Input: nums = [0, 1, 2, 3, 4], index = [0, 4, 1, 2, 3] Output: [0, 4, 1, 2, 3]

Example 2 Input: nums = [1, 2, 3, 4, 0], index = [0, 1, 2, 3, 0] Output: [1, 2, 3, 4, 1]

CodePudding user response：

Your example does not match your description. According to your example, you want to insert the nums[index[i]] in your target array's i'th position.

You can do this using Javascript's array.map function like this -

const targetArray = index.map(i => nums[i]);

You may need to add necessary sanity checks as well depending on the contexts.

CodePudding user response：

You can simply achieve this by using Array.forEach() along with Array.splice() method.

Live Demo :

const numsArr = [1, 2, 3, 4, 0];

const indexArr = [0, 1, 2, 3, 0];

let outputArr = [];

numsArr.forEach((elem, index) => {
    outputArr.splice(index, 0, numsArr[indexArr[index]]);
});

console.log(outputArr);