Modify JS function prototype to call functions with an object of arguments (similar to f(**dict) in Python)

gistfile1.txt

function function_params(func) {
	if (typeof(func) == "function") {
		let source_code = func.toString()
		let regex_paren = new RegExp("\\((.*)\\)")
		let args_str = regex_paren.exec(source_code)
		return args_str[1].split(",").map((x) => x.trim())
	}
}

Function.prototype.applyObj = function (obj) {
	let func = this
	let params = function_params(func)
	return func.apply(null, params.map((x) => obj[x]))
}


// Testing
function f(a, b) {
	console.log("f:", a, b)
}

const g = (a, b) => {
	console.log("g:", a, b)
}

const h = function(a, b) {
	console.log("h:", a, b)
}

// console.log(function_params(f))
// console.log(function_params(g))
// console.log(function_params(h))

console.log(f.applyObj({a: 5}))
console.log(g.applyObj({a: 5}))
console.log(h.applyObj({a: 5}))

console.log(f.applyObj({a: 5, b: 3}))
console.log(g.applyObj({a: 5, b: 3}))
console.log(h.applyObj({a: 5, b: 3}))

console.log(f.applyObj({a: 5, b: 3, c: 5}))
console.log(g.applyObj({a: 5, b: 3, c: 5}))
console.log(h.applyObj({a: 5, b: 3, c: 5}))