Node.js - delete specific functions from an array

Question

Node.js - delete specific functions from an array

Given an array of named functions, how can I delete all but a specified one? The functions are exported e.g. exports.foo. To mock an example:

var test = [];
test.push(foo = function(){});
test.push(bar = function(){});
console.log(test);

Logs:

[ [Function], [Function] ]

How can I delete all functions except a specified one e.g. bar?

EDIT: Some additional context - I have a set of plugins (functions) that get loaded automatically in to an array. As part of my Mocha tests, I wish to test each one individually, hence wanting to drop all but a specified function.

arrays
node.js
function
module
anonymous-function

Answer 1

I am going to question why you'd want to do this, but if you're set on doing it, this is how I'd approach it:

function deleteAllButThis(fn, arr){


  for(var i=0; i < arr.length; i++) {
     //if fn in array does NOT match fn passed in, 
     if (fn !== arr[i]) {
       arr.splice(i, 1); //remove current array item
     }
  }

  return arr;

}

And then you'd call it like this:

deleteAllButThis(foo, test);