is there a function to compare values of the arrays and extract the index numbers of matches?

Question

I have two arrays of strings and want to compare them by value and extract the index numbers of identical items of mainArray that are available in secondArray for example:

var mainArray = ["I", "am", "not", "a", "doctor"]
var secondArray = ["am", "doctor"]

var Result = [1,4]

lissettdm · Accepted Answer · 2020-10-24 20:56:52Z

1

you can use Array.prototype.indexOf()

const mainArray = ["I", "am", "not", "a", "doctor"];
const secondArray = ["am", "doctor"];
const result = secondArray.map(w => mainArray.indexOf(w));
console.log(result);

Note: This solution will return -1 for that cases when string doesn't match.

answered Oct 24, 2020 at 20:56

lissettdm

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Sina · Accepted Answer · 2020-10-24 20:31:41Z

0

You can use intersection method of lodash library.

const mainArray = ["I", "am", "not", "a", "doctor"]
const secondArray = ["am", "doctor"]

const result = _.intersection(mainArray, secondArray)
const resultIndices = result.map(i => mainArray.indexOf(i))

console.log(result)
console.log(resultIndices)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>

answered Oct 24, 2020 at 20:31

Sina

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