ycmjason

// Usage:   @include transition(width, height 0.3s ease-in-out);
// Output:  -webkit-transition(width 0.2s, height 0.3s ease-in-out);
//          transition(width 0.2s, height 0.3s ease-in-out);
//
// Pass in any number of transitions
@mixin transition($transitions...) {
  $unfoldedTransitions: ();
  @each $transition in $transitions {
    $unfoldedTransitions: append($unfoldedTransitions, unfoldTransition($transition), comma);
  }

ycmjason

const objectAssignDeep = (...objs) => objs.reduce((acc, obj) => Object.assign(acc, ...Object.keys(obj).map(key => {
  if (acc[key] instanceof Object && obj[key] instanceof Object) {
    return { [key]: objectAssignDeep({}, acc[key], obj[key]) };
  }                                                                       
  return { [key]: obj[key] };
})));

ycmjason

// Simple memoization, done

const memoize = (fn) => {
  const memo = {};
  return function(...args){
    const hash = JSON.stringify(args);
    if(hash in memo) return memo[hash];
    return fn(...args);
  };
};

ycmjason

const limitAsyncCalls = (fn, n) => {
  const cap = n;
  let executing_count = 0;
  let waitings = [];

  const wait = () => new Promise(res => waitings.push(res));
  const execute = async (fn, args) => {
    executing_count++;
    const result = await fn(...args);
    executing_count--;

ycmjason

const queue = (() => {
  const promises = {};
  return async (name, f) => {
    while(promises[name]) await promises[name];
    promises[name] = f();
    const res = await promises[name];
    promises[name] = undefined;
    return res;
  };
})();

ycmjason

function foldl(arr, f){
  return arr.reduce((arr, x, i) => {
    if(i === 0) return [x];
    return arr.concat([f(arr[i - 1], x)]);
  }, []);
}

ycmjason

Gitbook automatic generation of SUMMARY.md

This script generates the SUMMARY.md assuming the following folder structure. Paths ending with / denotes directories. ** denotes multiply layers or directories.

• ./ - gitbook root
• ./*/ - parts, will be generated as # Name of the directory
• ./**/*.md - articles
• ./*/**/ - chapters

Name operations

ycmjason

Code with Jason

A Pen by Yu Chun Man Jason on CodePen.

License.

ycmjason

function wait(n, cb){
  if(n <= 0) cb();
  let aggregated_result = {};
  let count = 0;
  return function done(res){
    Object.assign(aggregated_result, res);
    if(++count === n) cb(aggregated_result);
  }
}

ycmjason

function splitNumber(n, m_parts){
  var arr = [];
  var eachPart = Math.ceil(n / m_parts);
  for(var i = 0; i < m_parts; i++){
    arr.push(eachPart);
  }
  var diff = (eachPart * m_parts) - n;
  for(var i = 0; i < diff; i++){
    arr[i%arr.length]--;
  }