mche1987

//----- The ECMAScript 6 meta object protocol (MOP) implemented in ES5
// This is how getting a property is handled internally.
// Double underscore (__) implies internal operation.

Object.prototype.__Get__ = function (propKey, receiver) {
    receiver = receiver || this;
    var desc = this.__GetOwnProperty__(propKey);
    if (desc === undefined) {
        var parent = this.__GetPrototypeOf__();
        if (parent === null) return undefined;

mche1987

// === Arrays

var [a, b] = [1, 2];
console.log(a, b);
//=> 1 2


// Use from functions, only select from pattern
var foo = () => [1, 2, 3];

mche1987

While attempting to explain JavaScript's reduce method on arrays, conceptually, I came up with the following - hopefully it's helpful; happy to tweak it if anyone has suggestions.

Intro

JavaScript Arrays have lots of built in methods on their prototype. Some of them mutate - ie, they change the underlying array in-place. Luckily, most of them do not - they instead return an entirely distinct array. Since arrays are conceptually a contiguous list of items, it helps code clarity and maintainability a lot to be able to operate on them in a "functional" way. (I'll also insist on referring to an array as a "list" - although in some languages, List is a native data type, in JS and this post, I'm referring to the concept. Everywhere I use the word "list" you can assume I'm talking about a JS Array) This means, to perform a single operation on the list as a whole ("atomically"), and to return a new list - thus making it much simpler to think about both the old list and the new one, what they contain, and

mche1987

Git Cheat Sheet

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Commands

Getting Started

git init

or