Nodejs Array Fill fill(value)

Method Source Code

Array.prototype.fill = function(value) {
    // Steps 1-2.
    if (this == null) {
        throw new TypeError('this is null or not defined');
    }//from  w  w  w  .  j  a  v  a  2s . co m

    var O = Object(this);

    // Steps 3-5.
    var len = O.length >>> 0;

    // Steps 6-7.
    var start = arguments[1];
    var relativeStart = start >> 0;

    // Step 8.
    var k = relativeStart < 0 ?
        Math.max(len + relativeStart, 0) :
        Math.min(relativeStart, len);

    // Steps 9-10.
    var end = arguments[2];
    var relativeEnd = end === undefined ?
        len : end >> 0;

    // Step 11.
    var final = relativeEnd < 0 ?
        Math.max(len + relativeEnd, 0) :
        Math.min(relativeEnd, len);

    // Step 12.
    while (k < final) {
        O[k] = value;
        k++;
    }

    // Step 13.
    return O;
};

Related

1. fill( val )

   Array.prototype.fill = function( val ) {
     var len = this.length, i;
     if(val instanceof Array){
       for( i = len-1; i >= 0; i--){
         this.push(val);
     } else {
       for( i = 0; i < len; i++){
         this[i] = val;
   ...
   

2. fill(first, last, value)

   Array.prototype.fill = function (first, last, value) {
       var i;
       for (i = first; i <= last; i++) {
           this[i] = value;
   

3. fill(n, get)

   Array.prototype.fill = function(n, get)
       for (var i = 0; i < n; i++)
           this[i] = get(i)
       return this
   

4. fill(n,v)

   var n = process.argv[2],
     base = process.argv[3],
     decoration = process.argv[4];
   Array.prototype.fill = function(n,v) {
       n = n || this.length;
       for( var i = 0; i < n; i++ )  {
           this[i] = v === undefined ? i : v;
       return this;
   ...
   

5. fill(value)

   Array.prototype.fill = function (value) {
       var size = this.length;
       while (size > 0) {
           this[--size] = value;
       return this;
   };
   

6. fill(x, y, v, starti, startj)

   Array.prototype.fill = function (x, y, v, starti, startj) {
     if ( ! starti ) {
       starti = 0;
     if ( ! startj ) {
       startj = 0;
     var matrix = this;
     for ( var i = starti; i <= x; i++ ) {
   ...