JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.5.2/underscore-min.js"></script>

JavaScript

var removeValue = function(array, id) {
    return _.reject(array, function(item) {
        return item === id;
    });
};
var array = [1, 20, 50, 60, 78, 90];
var id = 50;

console.log(removeValue(array, id)); // [1, 20, 60, 78, 90]
console.log(_.without(array, id)); // [1, 20, 60, 78, 90]
console.log(_.without(array, 60)); // [1, 20, 60, 78, 90]

var array2 = [1, 1, 1];
var array3 = [2, 2, 2];

console.log(_.union(array2, array3));