feature: last should allow set

[tjmehta]

last(arr, key, val)

[stoeffel]

I would prefer to keep last simple.

You could use lens for that.

var lens = require('101/lens');
var last = require('101/last');

var lastLens = lens(
    last,
    function(val, arr) { 
      var clone = arr.slice(); 
      clone[arr.length-1] = val; 
      return clone; 
    }
);

lastLens([1, 2, 3, 4]); // => 4
lastLens.set(6, [1, 2, 3, 4]); // => [1, 2, 3, 6]

Or a new function setLast?