Question

77

Using lodash to check whether an array has duplicate values

rated 0 times [ 83] [ 6] / answers: 1 / hits: 40383 / 9 Years ago, wed, february 11, 2015, 12:00:00

What do you all think would be the best (best can be interpreted as most readable or most performant, your choice) way to write a function using the lodash utilities in order to check an array for duplicate values.

I want to input ['foo', 'foo', 'bar'] and have the function return true. And input ['foo', 'bar', 'baz'] and have the function return false.

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clarissakourtneyb

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2 Years ago

answered 9 Years ago tayla · Accepted Answer

You can try this code:

function hasDuplicates(a) {

  return _.uniq(a).length !== a.length; 

}



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

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



document.write(hasDuplicates(a), ',',hasDuplicates(b));

<script src=http://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.1.0/lodash.min.js></script>