Jason Bellamy jasonbellamy

jasonbellamy / es5-arguments-error.js

Created September 23, 2015 21:16

Arguments is an "array like" object so you cannot directly iterate over it.

	var square = function () {
	return arguments.map(function(arg) {
	return arg * arg;
	});
	};

	square(1, 2, 3, 4, 5); // => "TypeError: arguments.map is not a function

jasonbellamy / es5-arguments.js

Last active September 23, 2015 21:20

We can convert arguments to a proper array with Array.prototype.slice and then we can iterate over it.

	var square = function() {
	var args = Array.prototype.slice.call(arguments); // convert arguments to array.

	return args.map(function(arg) {
	return arg * arg;
	});
	};

	square(1, 2, 3, 4, 5); // => [1, 4, 9, 16, 25]

jasonbellamy / es6-spread.js

Created September 23, 2015 21:22

Using the ..spread operator gives us a proper array from the start and lets us stop using the arguments object.

jasonbellamy / es6-spread-bonus.js

Created September 23, 2015 21:25

Succinct version of the square function written in ES6

	const square = (...args) => args.map((arg) => arg * arg);

	square(1, 2, 3, 4, 5); // => [1, 4, 9, 16, 25]

jasonbellamy / es5-arguments-imperative-sum-error.js

Created October 9, 2015 00:34

Imperative sum function that mistakenly tries to use the arguments object like an Array.

	var sum = function () {
	var result = 0;

	arguments.forEach(function(number) {
	result = result + number;
	});

	return result;
	};

jasonbellamy / es5-arguments-imperative-sum.js

Last active October 9, 2015 00:43

Imperative sum function that converts the arguments object to an Array.

	var sum = function () {
	var result = 0;
	var args = Array.prototype.slice.call(arguments); // convert arguments into array

	args.forEach(function(number) {
	result = result + number;
	});

	return result;
	};

jasonbellamy / function-using-anonymous-function-wrappers.js

Created October 14, 2015 01:10

An example of a function thats uses unneeded anonymous function wrappers.

jasonbellamy / function-using-bind.js

Last active October 19, 2015 16:02

An example of a function thats uses .bind instead of anonymous function wrappers.

	var stateManger = function () {
	var active = false;
	var setState = function(state) {
	active = state;
	};

	return {
	toggle : setState.bind(this, !active),
	setActive : setState.bind(this, true),
	setInactive : setState.bind(this, false)

jasonbellamy / reduce-map.doge

Last active January 12, 2016 22:59

Implementation of map & reduce in dogescript - https://dogescript.com/

	shh reduce
	such reduce much fn xs accum index
	rly index === xs.length -1
	wow accum
	wow reduce(fn, xs, fn(accum, xs[index + 1]), index + 1)


	shh map
	such map much fn xs
	such _map much previous current

jasonbellamy / factory.js

Created March 30, 2016 13:57

	function functionFactory({ type, ...rest }) {
	switch(type) {
	case 'hi':
	return hello(rest);
	case 'bye':
	return goodbye(rest);
	}
	};

	function hello({ name }) {