Javascript Array chunk(chunkSize)

Array.prototype.chunk = function(chunkSize) {
  var array = this;

  return [].concat.apply([],
    array.map(function(elem,i) {
        return i%chunkSize ? [] : [array.slice(i,i+chunkSize)];
    })//from   w  ww  . j a va  2  s  .c o  m
  );
};

// Splits an array in multiple subarrays with arbitrary length
Array.prototype.chunk = function(chunkSize) {
    var R = [];//ww  w. jav a  2  s. c  o m
    for (var i=0; i<this.length; i+=chunkSize)
        R.push(this.slice(i,i+chunkSize));
    return R;
}

Array.prototype.chunk = function chunk(chunkSize) {
    var array=this;
    return [].concat.apply([],
        array.map(function(elem,i) {
            return i%chunkSize ? [] : [array.slice(i,i+chunkSize)];
        })//from  www. j  ava  2s.  c  o  m
    );
};

/* eslint-disable no-extend-native */
Array.prototype.chunk = function (n) {
  if (!this.length) {
    return []//from www.j ava  2  s.  c  om
  }
  return [ this.slice(0, n) ].concat(this.slice(n).chunk(n))
}

// Chunk the underlying array.
Array.prototype.chunk = function(size) {
  var chunks = [];
  for (key = 0; key < this.length; key += size) {
    chunks.push(this.slice(key, key+size));
  }//from  w w  w  .j  a  v  a 2 s. co m
  return chunks;
}

// Transform the underlying array to dynamic options.
Array.prototype.options = function(textKey, valueKey) {
  var options = [];
  options = this.map(function(item) {
     return { text: item[textKey], value: item[valueKey] }
  });
  return options;
}