Nodejs Array Swap swapByIndex( i1, i2 )

Method Source Code

/**/*from   w ww  . j av  a2 s  .  com*/
 * Swaps two elements by their index in array
 *
 * @param {number} i1
 * @param {number} i2
 * @function swapByIndex
 * @memberof Array
 * @global
 */
Array.prototype.swapByIndex = function( i1, i2 ) {
   var e1 = null, e2 = null;
   i1 = checkFn( i1 );
   i2 = checkFn( i2 );

   if( typeof i1 === 'string' && i1 !== '' ) e1 = i1.toNumber();
   if( typeof i2 === 'string' && i2 !== '' ) e2 = i2.toNumber();

   if( e1 === -1 || this[i1] === undefined ) { throw new Error( 'No element with index \'' + i1 + '\' was found in array.' ); return; }
   if( e2 === -1 || this[i2] === undefined ) { throw new Error( 'No element with index \'' + i2 + '\' was found in array.' ); return; }

   var e = this[i1];
   this[i1] = this[i2];
   this[i2] = e;
};

Related

1. swap(x, y)

   function MathDist(xo, yo, x, y) {
     return Math.sqrt((x-xo)*(x-xo) + (y-yo)*(y-yo));
   function MathVecNorm(vx, vy) {
     return Math.sqrt(vx*vx + vy*vy);
   function MathDotProduct(a1, a2, b1, b2) {
     return a1*b1 + a2*b2;
   function MathSign(n) {
     return (n >= 0) ? 1 : -1;
   const MAX_RADIUS = 50.0;
   const MIN_RADIUS = 5;
   const MAX_DENSITY = 8.00 * 1/1963.495;
   const MIN_DENSITY =  0.50 * 1/1963.495;
   Array.prototype.swap = function (x, y) {
     var b = this[x];
     this[x] = this[y];
     this[y] = b;
     return this;
   function NewArray2d(rows, columns) {
      var array = new Array(rows);
      for (var i = 0; i < rows; i++) {
          array[i] = new Array(columns);
      return array;
   

2. swap(x, y)

   "use strict";
   function Median(A) {
       var n = A.length;
       if (n == 1) {
           return A[0];
       } else {
           return Select(A, 0, Math.floor(n / 2), n - 1);
   function Select(A, l, m, h) {
       var pos = Partition(A, l, h);
       if (pos == m) {
           return A[pos];
       } else if (pos > m) {
           return Select(A, l, m, pos - 1);
       } else if (pos < m) {
           return Select(A, pos + 1, m, h);
   function Partition(A, l, h) {
       var pivotval = A[l];
       var pivotloc = l;
       var j;
       for (j = l + 1; j <= h; j = j + 1) {
           if (A[j] < pivotval) {
               pivotloc = pivotloc + 1;
               A.swap(pivotloc, j);
       A.swap(l, pivotloc);
       return pivotloc;
   Array.prototype.swap = function (x, y) {
       var tmp = this[x];
       this[x] = this[y];
       this[y] = tmp;
       return this;
   };
   module.exports = Median;
   

3. swap(x, y)

   Array.prototype.swap = function(x, y) {
       if (x > this.length || y > this.length || x === y) {
           return
       var tem = this[x];
       this[x] = this[y];
       this[y] = tem;
   

4. swap(x, y)

   Array.prototype.swap = function(x, y){
     var temp = this[x];
     this[x] = this[y];
     this[y] = temp;
     return this;
   

5. swapArray(index_a, index_b)

   RegExp.escape = function(s) {
       return s.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
   };
   Array.prototype.swapArray = function(index_a, index_b) {
       var temp = this[index_a];
       this[index_a] = this[index_b];
       this[index_b] = temp;
   

6. swapByValue( v1, v2 )

   Array.prototype.swapByValue = function( v1, v2 ) {
     var i1 = null, i2 = null;
     v1 = checkFn( v1 );
     v2 = checkFn( v2 );
     for( var i = 0; i < this.length; i++ )
       if      ( this[i] === v1 ) i1 = i;
       else if( this[i] === v2 ) i2 = i;
     if( i1 === null ) { throw new Error( 'No element with value \'' + v1 + '\' was found in array.' ); return; }
     if( i2 === null ) { throw new Error( 'No element with value \'' + v2 + '\' was found in array.' ); return; }
   ...