JavaScript array object implementation adds a method to return random elements_javascript skills

The example in this article describes the implementation of a JavaScript array object to add a method that returns random elements. Share it with everyone for your reference. The details are as follows:

Core features:

Random probability, random order, random bubbling

This method comes from personal handwriting JavaScript practice, only involves the JavaScript 1.5 (ECMAscript 3 international standard) language itself, and is common in all JS engine implementations~

Add random method to Array object:

(function () {
  function Random_SN(iArray) {
    return Math.floor(Math.random() * iArray.length);
  }
  function Probability_Random(iArray) {
    var Random_Int;
    if (iArray.Random_SN === undefined)
      iArray.Random_SN = -1;
    do Random_Int = Random_SN(iArray);
    while ( Random_Int == iArray.Random_SN )
    iArray.Random_SN = Random_Int;
    return iArray[Random_Int];
  }
  function Sequence_Random(iArray) {
    return iArray.splice(Random_SN(iArray), 1)[0];
  }
  Array.prototype.random = function (Mode, Pop) {
    if (! Mode)
      return Probability_Random(this);
    if (! Pop) {
      if (! (this.Random_Queue && this.Random_Queue.length))
        this.Random_Queue = [].concat(this);
      return Sequence_Random(this.Random_Queue);
    }
    return Sequence_Random(this);
  };
})();

Usage example:

// 【概率随机】
//
// 元素的返回 完全随机，出现几率不定，有限次调用不保证能返回所有元素
var iElement = iArray.random();
// 【顺序随机】
//
// 元素的返回 有周期性，在每个周期内，元素都出现一次，但顺序不定
var iElement = iArray.random(true);
// 【随机冒泡】
//
// 每次调用都从原数组中随机取出一个元素返回（原数组 就地改变）
var iElement = iArray.random(true, true);

I hope this article will be helpful to everyone’s JavaScript programming design.