You can use filter.

var myArray = [1, 2, 3];



var oneAndThree = _.filter(myArray, function(x) { return x !== 2; });



console.log(allButThisOne); // Should contain 1 and 3.

Edited: For your specific code, use this:

friends = _.filter(friends, function (f) { return f.friend_id !== 14; });