Could you please help to convert this array:
['John', 'Paul', 'George', 'Ringo']
using this array:
[3, 1, 2, 0]
to this:
['Ringo', 'Paul', 'George', 'John']
Thanks a million!
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You can do it in many different ways (some more sensible than others); you can see some examples here: jsfiddle.net/fusnaz2xsecan– secan2021-01-26 12:16:35 +00:00Commented Jan 26, 2021 at 12:16
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5 Answers
You can map your array of indexes to their corresponding values from your name array using .map():
const names = ['John', 'Paul', 'George', 'Ringo']
const nums = [3, 1, 2, 0];
const res = nums.map(i => names[i]);
console.log(res);
Comments
You could iterate through both arrays and store it to a new array.
var x = [];
var arr = ["John", "Paul", "George", "Ringo"];
var arr2 = [3, 1, 2, 0];
for(var i = 0; i < arr.length; i++){
var val = arr2[i];
x[val] = arr[i];
}
//"x" has your finalized array.
Comments
use array.proto.forEach
const arr = ["a", "b", "c", "d"];
const order = [4, 3, 2, 1];
const newArr = []
order.forEach(item=>{
newArr.push(arr[item-1]);
//minus 1 because 4th item is actually [3] index
});
console.log(newArr);
Comments
const arr1 = ["John", "Paul", "George", "Ringo"];
const arr2 = [3, 1, 2, 0];
const newArr = new Array(arr1.length).fill(0); // Creating an array in the size of arr1 with all values set to 0
arr1.forEach((el ,i) => { // Iterating over arr1 and getting the current element and its index
newArr[arr2[i]] = el; // Placing the current element in the needed index in the new array (arr2[i] is the needed index from arr2)
})
1 Comment
PeterS
Please explain why this would work and what the OP did wrong/right. This will help them and any further readers.