JavaScript: Get a list of elements that exist in both arrays, after applying the provided function to each array element of both
JavaScript fundamental (ES6 Syntax): Exercise-210 with Solution
Write a JavaScript program to get a list of elements in both arrays, after applying the provided function to each array element of both.
- Use Array.prototype.filter() and Array.prototype.findIndex() in combination with the provided comparator to determine intersecting values
Sample Solution:
JavaScript Code:
//#Source https://bit.ly/2neWfJ2
const intersectionBy = (a, b, fn) => {
const s = new Set(b.map(x => fn(x)));
return a.filter(x => s.has(fn(x)));
};
console.log(intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor));
Sample Output:
[2.1]
Flowchart:

Live Demo:
See the Pen javascript-basic-exercise-210-1 by w3resource (@w3resource) on CodePen.
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