How to remove undefined values from array but keep 0 and null

You can use _.compact(array);

Creates an array with all falsey values removed. The values false, null, 0, "", undefined, and NaN are falsey.

See: https://lodash.com/docs/4.15.0#compact

The best way using lodash is _.without

Example:

const newArray = _.without([1,2,3,undefined,0,null], undefined);

No need for libraries with modern browsers. filter is built in.

    var arr = [ 1, 2, 3, undefined, 0, null ];
    var updated = arr.filter(function(val){ return val!==undefined; });
    console.log(updated);

With lodash, you can do simply:

var filtered = _.reject(array, _.isUndefined);

If you also want to filter null as well as undefined at some point:

var filtered = _.reject(array, _.isNil);

Related