Bolter

Bolter is a tool for making functions with optional arguments (I mean, it can be in the middle of the function argument list, not in the end). It will fill missing args with undefined, so you don't need to make a lot of conditions.

Installation

npm i bolter

Usage

const bolter = require("bolter");
 
// these examples will help you to understand how all it works
const getArgs = bolter(function() { // Function it self
    return [].slice.call(arguments);
}, [String, Number, Function]); // The list of possible arguments
 
getArgs("test"); // => ["test", undefined, undefined]
getArgs(1, function() {}); // => [undefined, 1, [Function]]
getArgs("test", function() {}); // => ["test", undefined, [Function]]
getArgs("test", 1, function() {}); // => ["test", undefined, [Function]]
getArgs({}); // => [undefined, undefined, undefined]
 
// example with static args
bolter((a, b) => [a, b], [1, Number])(228); // => [1, 228]