Custom multimethod dispatch using the typeof operator (ENJOY.js)

multimethods-dispatch-typeof-example.js

var method = require("enjoy-js").method;
var dispatch = require("enjoy-js").dispatch;
var specialize = require("enjoy-js").specialize;

var concat = method();

dispatch(concat, type_of, type_of);

specialize(concat, "string", "string", function (a, b) {
    return a + b;
});

specialize(concat, "number", "number", function (a, b) {
    return ("" + a) + ("" + b);
});

function type_of (thing) {
    return typeof thing;
}


// Using it:

console.log(concat("foo", "bar"));
console.log(concat(1.2, 34));