Nodejs Array Range rangeArray(startIndex, endIndex)

Method Source Code

/**/*www. ja  va2 s.com*/
 * Returns an array with elements populated between the specified range(INCLUSIVE)
 *
 * @extends Array
 * @function rangeArray
 * @param {number} startIndex - Start element of the array to be built
 * @param {number} endIndex - End element of the array to be built
 * @return {array}
 *
 * Examples:
 *    (new Array()).rangeArray(0, 5);
 *    ([]).rangeArray(0, 5);
 *    => [0, 1, 2, 3, 4, 5]
 */
Array.prototype.rangeArray = function (startIndex, endIndex) {
  var arr = []
  for(var i=startIndex; i<endIndex; i++) {
    arr.push(i);
  }
  return arr;
}

Related

1. range(start, count)

   Array.range  = function(start, count) {
     var arr = [],
         val = start;
     while(count > 0) {
       arr.push(val);
       count--;
       val++;
     return arr;
   ...
   

2. range(start, end)

   Array.range = function (start, end) {
     var a = [], i;
     for (i = start; i < end; i += 1) {
       a[i] = i;
     return a;
   

3. range(start, end)

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

4. range(start,end)

   Array.prototype.range = function(start,end){
     return Array.apply(null, Array(end-start+1)).map(function (_, i){
         return start+i;
     });
   };
   

5. range(start,end,step)

   Array.prototype.range = (start,end,step)=>{
       const stepVal = step || 1
       const set = new Set()
       for (var i=start;i<=end;i=i+stepVal){
           set.add(i)
       return [...set]
   Set.prototype.union = function (set) {
   ...