Nodejs Array Sort sortBy( field, ascending_order )

Here you can find the source of sortBy( field, ascending_order )

Method Source Code

/**//from  ww  w. j ava  2s  .c  o m
 * JS para el ordenamiento de arreglos del tipo [[]]
 * 
 *  Ejemplo de uso:
 *  
 *  Si tenemos un arreglo definido de esta forma:
 *  var arreglo = [ [ 12, 'CCC', 'aa', 'y1y' ],
 *                  [ 58, 'DDD', 'bb', 'y4y' ],
 *                  [ 28, 'AAA', 'dd', 'y0y' ],
 *                  [ 18, 'BBB', 'cc', 'y3y' ] ];
 *
 *  Podemos ordenarlo usando el metodo 'sortBy' que se ha agregado 
 *  al prototipo del tipo de objeto 'Array:
 *  var newA = arreglo.sortBy(0, true);
 *
 *  Aqu? hemos indicado que el ordenamiento ser? ascendente y por el primer 
 *  campo de cada elemento del arraglo, el indice del arreglo inicia en cero!!.
 *  
 * */

Array.prototype.sortBy= function( field, ascending_order ) {
   var asc = ascending_order ? 1 : -1;
   return this.sort(function (a, b) {
          return (asc *(a[field] <= b[field]) ? -1:1);
   });
};

Related

  1. sort(fn)
    Array.prototype.sort = function(fn) {
      if (!arguments[0]) {
        fn = function(a, b) {
          return a.compareTo(b);
        };
      for (var i = 0, len = this.length; i < len - 1; i++) {
        for (var j = i + 1, len = this.length; j < len; j++) {
          if (fn(this[i], this[j]) > 0) {
    ...
    
  2. sortABC( property )
    Array.prototype.sortABC = function( property )
      return this.sort( function( a,b)
        var links = a[property].replace(/?, "Oe").replace(/?, "Ae").replace(/?,"Ue");
        var rechts = b[property].replace(/?, "Oe").replace(/?, "Ae").replace(/?,"Ue");
        if( links < rechts) return -1;
        if( links > rechts) return 1;
        return 0;
    ...
    
  3. sortAscending()
    Array.prototype.sortAscending = function() {
      return this.sort( function( a, b ) {
        if ( a > b ) {
          return 1;
        return a < b ? -1 : 0;
      } );
    };
    
  4. sortAscending()
    Array.prototype.sortAscending = function() {
      this.sort(function(a, b) {
        return a - b;
      });
      return this;
    };
    var largestProductOfThree = function(array) {
      array = array.slice().sortAscending();
      var secondFromLast = array[array.length - 2];
    ...
    
  5. sortBool(iteratee)
    Array.prototype.sortBool = function(iteratee) {
        var _iteratee = function(a, b) {return iteratee(a, b) ? -1 : 1};
        return this.sort(_iteratee);
    };
    
  6. sortBy(()
    Array.prototype.sortBy = (function() { 
        function identity(v){return v;} 
        function ignoreCase(v){return typeof(v)==="string" ? v.toLowerCase() : v;} 
        function makeCompareFunction(f, opt){ 
            opt = typeof(opt)==="number" ? {direction:opt} : opt||{}; 
            if(typeof(f)!="function"){ 
                var prop = f; 
                f = function(v1){return !!v1[prop] ? v1[prop] : "";} 
            if(f.length === 1) { 
                var uf = f; 
                var preprocess = opt.ignoreCase?ignoreCase:identity; 
                f = function(v1,v2) {return preprocess(uf(v1)) < preprocess(uf(v2)) ? -1 : preprocess(uf(v1)) > preprocess(uf(v2)) ? 1 : 0;} 
            if(opt.direction === -1) return function(v1,v2){return -f(v1,v2)}; 
            return f; 
        return function(callbacks){ 
            var array = this; 
            function tb(func, opt) { 
                var x = typeof(this) == "function" ? this : false; 
                var y = makeCompareFunction(func, opt); 
                var f = x ? function(a, b) { 
                                return x(a,b) || y(a,b); 
                          : y; 
                f.thenBy = tb; 
                f.sort = () => array.sort(f); 
                return f; 
            return tb(callbacks); 
        }; 
    })();
    
  7. sortBy()
    Array.prototype.sortBy = function() {
          function _sortByAttr(attr) {
              var sortOrder = 1;
              if (attr[0] == "-") {
                  sortOrder = -1;
                  attr = attr.substr(1);
              return function(a, b) {
                  var result = (a[attr] < b[attr]) ? -1 : (a[attr] > b[attr]) ? 1 : 0;
    ...
    
  8. sortBy(comparator)
    Array.prototype.sortBy = function(comparator) {
        return this.sort((a,b) => {
            return comparator(a) < comparator(b) ? -1 : 1
        })
    
  9. sortBy(f)
    Array.prototype.sortBy = function (f) {
        return this.sort(function (a, b) {
            if (a[f] < b[f])
                return -1;
            if (a[f] > b[f])
                return 1;
            return 0;
        });
    };
    ...