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JavaScript

Resources

Type MDN
Array MDN
Date MDN
Object MDN
String MDN
JSON MDN
Set MDN
RegExp MDN
Destructuring Assignment MDN
const MDN
let MDN
export MDN

strict mode

Begin files with:

'use strict';

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode

Arrow functions: () => {}

const a = (param1, param2) => {
  return param1 + param2;

}

const b = (param1, param2) => param1 + param2;

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions

String

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String

UTF Support

https://stackoverflow.com/questions/16293923/does-v8-have-unicode-support https://github.com/v8/v8/blob/master/include/v8.h

window

window.location.hash

console.log(window.location.hash);

Results:

#array

Results will always be prefixed with #

scroll

Scroll to a part of the screen.

window.location.hash = '#object'

trailing commas

http://exploringjs.com/es2016-es2017/ch_trailing-comma-parameters.html

Simple Assert

input = "a b c d e";

main(input) {
  ...
}

assert(expected, input) {
  console.log(input);
  actual = main(input);
  result = expected === actual;
  console.log(result);
  if (!result) {
    console.log(actual);
    console.log(expected);
  }
}

// Case 1
assert(expected, input);

// Case 2
assert(expected2, input2);

// Case 3
assert(expected3, input3);

``querystring``

Warning: querystring.stringify does not stringify deeply nested objects.

Classes

class Animal {
  constructor() {
  }
}

class Cat extends Animal {
  constructor(props) {
    super(props)
  }
}

Flow vs TypeScript

Flow

https://flow.org/en/docs/config/

https://github.com/facebook/relay/blob/master/.flowconfig https://github.com/facebook/react/blob/master/.flowconfig https://github.com/graphql/graphql-js/blob/master/.flowconfig

ESLINT

Alternatives

Frameworks

ORM