node package manager

fnoverload

Help library for function overloading in JavaScript

fnoverload - Function overloading for JavaScript

There are several libraries out there that can do function overloading, but none have had an innocent enough syntax for me. I hope that others will find my version easy to use.

Please remember that unlike true overloading, this is psuedo-overloading that is performed in runtime. I have not benchmarked it in any way

var o = require('fnoverload');
 
 
// Simple argument-count overloading 
var func1 = o(
 
function(var1) {
console.log("Single var: " + var1);
},
function(var1var2) {
console.log("Two vars: "  + var1 + "," + var2);
}
);
 
 
 
// More advanced, type-based overloading 
var func2 = o(
 
// expects string 
o.function(String,
function(str) {
console.log("String: " + str);
}),
// expect string and a number, both "o.function" and "o.f" works 
o.f(String, Number, 
function(strnum) {
console.log("String is: " + str + ", num is: " + num);
})
);
 
func1("hi");
// outputs: Single var: hi 
 
func1("hi", "hello");
// outputs: Two vars: hi,hello 
 
 
func2("hi mate", 3);
// outputs: String is: hi mate, num is: 3 
 

Both methods(simple and advanced) can be mixed in an var func = o(...) statement, but type-based functions will be chosen before argument-count