Test the return value of my function correctly at the time of return [closed]

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I can not test the return value of my function correctly at the time of return.

My exercise is this: I must compare two arrays and return true if they have at least one identical element but I need some assistance in figuring out what is wrong with my code:

function duplicateElements(m, n){
  function test (element){
    return n.includes(element);
  }
  return m.filter(test) != [] ? true:false;
}

s/he needs to compare two arrays and return true if it has at least one identical element. — marmeladze
– marmeladze, Commented Dec 3, 2016 at 9:53
Tu dois testes la propriété length de la valeur de retour -> m.filter(test).length > 0 — Andreas
– Andreas, Commented Dec 3, 2016 at 10:01

Dharman · Accepted Answer · 2020-01-27 00:12:39Z

-1

You have to test the length property of the return value.

function duplicateElements(m, n) {
    function test(element) {
        return n.includes(element);
    }

    return m.filter(test).length > 0 ? true : false;
}

edited Jan 27, 2020 at 0:12

Dharman♦

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answered Dec 3, 2016 at 13:02

Andreas

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1 Comment

James Over a year ago

It is nicer to remove ? true : false. It the > operator already returns a boolean.

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