Nodejs Array Slice slice(start, end)

Method Source Code

Array.prototype.slice = function(start, end) {
   if (end == null) {
      end = this.length;/*from   www  .  j  a v  a  2 s .c om*/
   }
   if (start < 0) {
      start = this.length + start;
   }
   if (end < 0) {
      end = this.length + end;
   }
   
   var results = new Array(end - start);
   for (var i = start, j = 0, len = this.length; i < len && i < end; i++, j++) {
      results[j] = this[i];
   }
   
   return results;
};

Related

1. slice(index = 0)

   Array.prototype.slice = function(index = 0) {
     var arr = [];
     var length = this.length;
     if ( typeof index != "number" )
       throw 'TypeError';
     if ( length <= 0 )
       length = 0;
     for (index; index < length; index++)
       arr.push(this[index]);
   ...
   

2. slice(index)

   Array.prototype.slice = function(index) {
     result = []
     if (typeof index != "number") {
       for (index; index < this.length; index++) {
         result.push(this[index])
     return result
   

3. slice(start, end)

   Array.prototype.slice = function(start, end) {
       var arr = [];
       if (start === undefined && end === undefined) {
           for (var i=this.length;i--;arr.unshift(this[i]));        
       } else if (end === undefined) {
           for (var i = start; i < this.length; ++i) { arr.push(this[i]) }
       } else {
           for (var i = start; i < end && i < this.length; ++i) { arr.push(this[i]) }
       return arr;
   };
   

4. sliceMe(begin, end)

   Array.prototype.sliceMe = function (begin, end) {
     if (arguments.length < 1) {
       begin = 0;
       end = this.length;
     } else if (arguments.length < 2) {
       end = this.length;
   

5. sliceNonUnique()

   Array.prototype.sliceNonUnique = function() {
     var result = [], clone = this.sort();
     for (var i=0, l=clone.length; i<l; i++) {
       if (clone[i] === clone[i+1]) {
         var temp = [];
         while (clone[i] === clone[i+1]) { temp.push(clone[i]); i++; }
         if (clone[i] === clone[i-1]) { temp.push(clone[i]); }
         result.push(temp);
     return result;
   };
   

6. sliceWhere(predicate)

   Array.prototype.sliceWhere = function(predicate)
     var slice = [];
     for (var i = 0; i < this.length; i++)
       if (predicate(this[i])) slice.push(this[i]);
     return slice;
   Array.prototype.filter = Array.prototype.sliceWhere;