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Frequency of elements of one array that appear in another array using JavaScript
Problem
We are required to write a JavaScript function that takes in two arrays of strings. Our function should return the number of times each string of the second array appears in the first array.
Example
Following is the code −
const arr1 = ['abc', 'abc', 'xyz', 'cde', 'uvw'];
const arr2 = ['abc', 'cde', 'uap'];
const findFrequency = (arr1 = [], arr2 = []) => {
const res = [];
let count = 0;
for (let i = 0; i < arr2.length; i++){
for (let j = 0; j < arr1.length; j++){
if (arr2[i] === arr1 [j]){
count++;
}
}
res.push(count);
count = 0;
}
return res;
};
console.log(findFrequency(arr1, arr2));Output
[2, 1, 0]
Updated on: 20-Apr-2021
398 Views
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