Nodejs Array Range range()

Method Source Code

// Returns an array of elements by indices or between a start and end index

Array.prototype.range = function() {

    function isArray(instance) {
        return Object.prototype.toString.call(instance) !== '[object Array]';
    }// www  .  ja  v  a2  s  .  com

    // Prototypes throw TypeErrors when the context or arguments are invalid

    if (!isArray(this)) {
        throw new TypeError("`this` must be Array, not " + typeof this);
    }

    if (arguments.length === 0) {
        throw new TypeError("Missing required argument(s)");
    }

    // Pluck elements at given indices

    if (isArray(arguments[0])) {
        var result = [],
            indices = arguments[0];

        for (var i = 0, l = indices.length; i < l; i++) {
            result.push(this[indices[i]]);
        }

        return result;
    }

    // Return elements starting from given index through end of array

    return this.slice(arguments[0], arguments[1]);
};

Related

1. range()

   Array.prototype.range = function(){
     var a = this.natsort();
     return this[a.length-1]-a[0];
   };
   

2. range()

   Array.prototype.range = function() {
     var min = null,
       max = null,
       sum = null,
       i, len;
     for (i = 0, len = this.length; i < len; ++i) {
       var elem = this[i];
       sum += elem;
       if (min === null || min > elem) min = elem;
   ...
   

3. range(end, step)

   Array.range = function (end, step) {
     var array = [];
     for (var i = step; i <= end; i += step) {
       array.push(i);
     return array;
   

4. range(first, second)

   Array.prototype.range = function(first, second) {
     var range = []
     console.log(typeof second)
     if (typeof second === 'undefined') {
       for (var i = 0; i < first; i++) {
         range.push(i)
       return range
     for (var i = first; i < second; i++) {
       range.push(i)
     return range
   

5. range(from, to)

   Array.prototype.range = function(from, to) {
     var result = []
     while (from <= to)
       result.push(from++)
     return result