Why is lodash some not working here as I expect?

Question

I have an array

arr = ["jenny", "lucy", "jason"]

I do

_.some(arr, "jenny")

and it throws false

Answer 1

Your call to _.some needs to have a function callback as its second parameter:

arr = ["jenny", "lucy", "jason"];
 _.some(arr, function(val) {return val === 'jenny'});

Answer 2

In your case (an array) the predicate must be a function to check the values.

var arr = ["jenny", "lucy", "jason"]
var result = _.some(arr, (x) => x === "jenny");

console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js"></script>

Resource

• _.some(collection, [predicate=_.identity])

  Arguments

  • collection (Array|Object): The collection to iterate over.
  • [predicate=_.identity] (Function): The function invoked per iteration.