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tincho / download.js
Created October 25, 2017 16:15
script for downloading HTTP-Auth'ed file through XHR
var form = document.getElementById("dlFile");
form.onsubmit = function(e) {
e.preventDefault();
var user = form.user.value; // "mayoristas";
var pass = form.pass.value;
requestFile(user, pass);
return false;
}
@tincho
tincho / alltogethernow.js
Last active June 11, 2018 16:17
all functional-programming js tools i've written
// var logHello = _partial(console.log, "hello ");
// logHello("world");
// accepts _partial (fn reference) as placeholder just like underscore accepts _
// var partialApplied = _partial(originalFn, _partial, "second", _partial, "fifth");
// partialApplied("first", "third") will call originalFn("first", "second", "third", "fifth")
function _partial() {
var args = Array.prototype.slice.call(arguments);
var method = args.shift();
var self = this;
@tincho
tincho / roller.js
Created November 22, 2018 19:09
timer function to change contents of DOM element at given interval (default: 5s)
// first iteration
// v0.1
(function(globalObject, document) {
function randomItem(collection) {
var index = Math.floor(Math.random() * collection.length);
return collection[index];
}
/**
* @license MIT
* @requires AngularJs 1.x
* @author github.com/tincho
* Tiny helper for listener deregistration on scope destroy
* You'll have to wrap it up in a module/provider/whatever
* (that's out of my focus)
*/
function LDisposer(scope) {
var _list = [];
@tincho
tincho / ary.js
Created December 6, 2018 14:53
ES5 vs ES6 function for fix a function to take up to N-arguments (see N-ary or arity)
// pre-ES6
function _ary(fn, arity) {
arity = arity || 1;
return function() {
// could use Array.from(arguments).slice(0, arity) ?
var args = Array.prototype.slice.call(arguments, 0, arity);
return fn.apply(null, args);
};
}
function getHeader(url, header) {
return new Promise(function(resolve, reject) {
var http = new XMLHttpRequest();
http.open('HEAD', url);
http.onreadystatechange = function() {
if (this.readyState !== this.DONE) return;
if (this.status != 200) {
reject(this.status);
} else {
@tincho
tincho / fetchVideoThumb.js
Last active December 18, 2018 15:15
Get an image preview from a video URL with vainilla JavaScript
// make a data uri encoded image from a <video> element using canvas
// (thank you stackoverflow people)
function videoElementToImage(videoElement, width, height) {
width = width || 360;
height = height || 240;
var canvas = document.createElement('canvas');
canvas.width = width;
canvas.height = height;
var context = canvas.getContext('2d');
context.drawImage(videoElement, 0, 0, canvas.width, canvas.height);
@tincho
tincho / copyValues.js
Last active January 28, 2019 17:04
utility to extract values at given paths from given objects
// iteration 0
// adding deep diving for key paths
// based on getProperty()
// try on tddbin.com
function copyFrom(obj) {
const values = (...keys) => keys.map(k => getProperty(k)(obj));
return { values };
}
@tincho
tincho / memoizeByProps.js
Last active September 19, 2019 19:55
memoize by props shortcut
const shallowCompare = (obj1, obj2) =>
typeof obj1 === 'object' && typeof obj2 === 'object'
? Object.keys(obj1).length === Object.keys(obj2).length &&
Object.keys(obj1).every(
key => obj2.hasOwnProperty(key) && obj1[key] === obj2[key]
)
: obj1 === obj2
const memoizeByProps = (...props) => Component =>
React.memo(Component, (prevProps, nextProps) =>
@tincho
tincho / loop.js
Created December 23, 2019 19:32
simple vainilla JS util to call a function each N milliseconds
const loop = {
timer: null,
count: 0,
start(fn, time=1000, limit = 100) {
fn(this.stop.bind(this), this.count);
this.count++;
if (this.count < limit) {
this.timer = setTimeout(() => this.start(fn, time, limit), time)
} else {
this.stop()