externalise

Turn member functions into functions accepting object as an argument.

For example:

var externalise = require('externalise');
var length = externalise('length');

length([1, 2, 3]);
// #=> 3

This is particularly useful when used in conjunction with higher-order functions like map from lodash.

var _ = require('lodash');

_.map(["hello", "world!"], externalise('length'));
// #=> [5, 6]

Also provided is externalise.proto, which externalises all functions on an object's prototype.

Identity = function (x) {
    this.value = x;
};

Identity.prototype.get = function () {
    return this.value;
};

Identity.prototype.set = function (value) {
    this.value = value;
    return this;
};

var externals = externalise.proto(Identity);

externals.get(new Identity(10));
// #=> 10

externals.set(new Identity(10), 100);
// #=> { value: 100 };

Lastly, feel free to rename your import externalize if the spelling is wrong in your region. :)