Lodash remove from string array

Question

I have an array of string and want to instantly remove some of them. But it doesn't work

var list = ['a', 'b', 'c', 'd']
_.remove(list, 'b');
console.log(list); // 'b' still there

I guess it happened because _.remove function accept string as second argument and considers that is property name. How to make lodash do an equality check in this case?

Answer 1

One more option for you is to use _.pull, which unlike _.without, does not create a copy of the array, but only modifies it instead:

_.pull(list, 'b'); // ['a', 'c', 'd']

Reference: https://lodash.com/docs#pull

Answer 2

As Giuseppe Pes points out, _.remove is expecting a function. A more direct way to do what you want is to use _.without instead, which does take elements to remove directly.

_.without(['a','b','c','d'], 'b');  //['a','c','d']

Answer 3

Function _.remove doesn't accept a string as second argument but a predicate function which is called for each value in the array. If the function returns true the value is removed from the array.

Lodas doc: https://lodash.com/docs#remove

Removes all elements from array that predicate returns truthy for and returns an array of the removed elements. The predicate is bound to thisArg and invoked with three arguments: (value, index, array).

So, if you want to remove b from your array you should something like this:

var list = ['a', 'b', 'c', 'd']
_.remove(list, function(v) { return v === 'b'; });
["a", "c", "d"]