I have an javascript array that has the following values,

let arr = ["2","3","4","5","6"];

I have a second array that has three integers,

let index = [1,3,4];

How would I use JQuery (or Javascript) to use the array to get the index from arr, and add it to a new array. I want to add these strings to a new array.

indexArr = ["3","5","6"]

Thanks

I have an javascript array that has the following values,

let arr = ["2","3","4","5","6"];

I have a second array that has three integers,

let index = [1,3,4];

How would I use JQuery (or Javascript) to use the array to get the index from arr, and add it to a new array. I want to add these strings to a new array.

indexArr = ["3","5","6"]

Thanks

• javascript
• jquery
• arrays
• indexing

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3 Answers 3

Sorted by: Reset to default 1

Simple, just use Array.prototype.map():

let arr = ["2","3","4","5","6"];
let index = [1,3,4];

let indexArr = index.map(i => arr[i]);

console.log(indexArr);

You can do it with simple .map

let arr = ["2","3","4","5","6"];
let index = [1,3,4];
index.map(x=>arr[x]) //["3", "5", "6"]

Just use a loop. Personally I prefer this method over map because I find this easier to understand, but it's personal preference.

let arr = ["2","3","4","5","6"];
let index = [1,3,4];
let indexArr = [];
for(var i=0; i<index.length; i++) {
    indexArr.push(arr[index[i]]);
}
console.log(indexArr);