const repeat

ConstRepeat.js

  // WARNING: dont use this with a custom element directive that sets scope
  // in the link.
  .directive('r77ConstRepeat', function() {
    return {
      transclude: 'element',
      // Priority is same as a normal ng-repeat
      priority: 1000,
      compile: function(elt, attr, linker) {
        return function(scope, iterStartElement, attr) {
          // Most of this code is stolen from angular.js for ngRepeat, we just
          // don't want to watch
          var expression = attr.r77ConstRepeat;
          var match = expression.match(/^\s*(.+)\s+in\s+(.*)\s*$/),
            lhs, rhs, valueIdent, keyIdent;
          if (! match) {
            throw Error("Expected r77ConstRepeat in form of '_item_ in _collection_' but got '" +
              expression + "'.");
          }
          lhs = match[1];
          rhs = match[2];
          match = lhs.match(/^(?:([\$\w]+)|\(([\$\w]+)\s*,\s*([\$\w]+)\))$/);
          if (!match) {
            throw Error("'item' in 'item in collection' should be identifier or (key, value) but got '" +
                lhs + "'.");
          }
          valueIdent = match[3] || match[1];
          keyIdent = match[2];

          var index, length,
              collection = scope.$eval(rhs),
              cursor = iterStartElement,
              arrayBound,
              childScope,
              key, value, // key/value of iteration
              array;

          if (!angular.isArray(collection)) {
            // if object, extract keys, sort them and use to determine order of iteration over obj props
            array = [];
            for(key in collection) {
              if (collection.hasOwnProperty(key) && key.charAt(0) != '$') {
                array.push(key);
              }
            }
            array.reverse();
          } else {
            array = collection || [];
          }

          arrayBound = array.length-1;

          // we are not using forEach for perf reasons (trying to avoid #call)
          var child_scopes = [];
          for (index = 0, length = array.length; index < length; index++) {
            key = (collection === array) ? index : array[index];
            value = collection[key];
            childScope = scope.$new();
            child_scopes.push(childScope);

            childScope[valueIdent] = value;
            if (keyIdent) childScope[keyIdent] = key; 
            childScope.$index = index;

            childScope.$first = (index === 0);
            childScope.$last = (index === arrayBound);
            childScope.$middle = !(childScope.$first || childScope.$last);

            linker(childScope, function(clone){
              cursor.before(clone);
            });
          }
          scope.$on('$destroy', function() {
            for (var i=0; i < child_scopes.length; i++) {
              child_scopes[i].$destroy();
            }
          });
        };
      }    
    };   
  })