angularjs - why we need to make pair in ng-option is select for Angular .? though we can make are work done witho -


hi can 1 tell me why need make "(k, v)" in

ng-options="k v (k, v) in types" can work done writing ng-options="k v v in types" also.

<div ng-app="myapp" ng-controller="myctrl">    <p>select car:</p>   <select ng-model="selectedcar" ng-options="y.brand (x, y) in cars">      </select>   <h1>you selected: {{selectedcar.brand}}</h1>  <h2>model: {{selectedcar.model}}</h2>  <h3>color: {{selectedcar.color}}</h3>   <p>the visible text inside dropdown list can property of value object.</p>  </div>  <script>    var app = angular.module('myapp', []);    app.controller('myctrl', function($scope) {       $scope.cars = {           car01 : {brand : "ford", model : "mustang", color : "red"},           car02 : {brand : "fiat", model : "500", color : "white"},           car03 : {brand : "volvo", model : "xc90", color : "black"}       }   });

examples

ng-options="single.value single.caption single in $ctrl.example.singles"    ng-repeat="(indexsingle, single) in ($ctrl.example.singles | filter:{isvisible:true})"   ng-repeat="single in $ctrl.example.singles"

you curious middle 1 here in example :

<div ng-repeat="(indexsingle, single) in ($ctrl.example.singles | filter:{isvisible:true})">      index = {{indexsingle}} <div>

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