Finding match element with array reduce

Question

I have two arrays

a. [1,2,3,4,5]

b. [2,3,4,5,6]

I try to find 2,3,4,5 with array.reduce because I think it is more efficient.

Can I do so?

if you have only two array then you can just `filter` it out. Maybe something like this: `a.filter(p=>b.includes(p))` — gorak, Jun 10 '20 at 08:53
If your arrays are that small, there should be no concern about efficiency. If however you have thousands of values, then use a `Set`. — trincot, Jun 10 '20 at 08:56

gorak · Answer 1 · 2020-06-10T09:03:30.193

1

This will get you the same result without using reduce:

var a=[1,2,3,4,5];
var b= [2,3,4,5,6];

result = a.filter(p=>b.includes(p));

console.log(result);

Or with reduce:

var a=[1,2,3,4,5];
var b= [2,3,4,5,6];

var result = b.reduce((acc,elem)=>{
    if(a.includes(elem)) acc.push(elem);
    return acc; 
},[]);

console.log(result);

edited Jun 10 '20 at 09:03

answered Jun 10 '20 at 08:55

gorak

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score 0 · Answer 2 · answered Jun 10 '20 at 08:55

0

With filter and includes

{
  const a = [1,2,3,4,5];

  const b = [2,3,4,5,6];
  
  let overlap = a.filter(e => b.includes(e))
  console.log(overlap)
}

answered Jun 10 '20 at 08:55

yunzen

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Finding match element with array reduce

2 Answers2