My array consists of objects structured like this:
{
__v: 0,
_id: "5835ced6ffb2476119a597b9",
castvote: 1,
time: "2016-11-23T17:16:06.676Z",
userid: "57e0fa234f243f0710043f8f"
}
I am looking to create new arrays that filter these objects based on the castvote values - one for objects where castvote is set as 1, and another for those with a castvote value of 2.
To achieve this functionality in the controller, utilize the $filter feature.
$scope.castvoteOne = $filter('filter')($scope.results, {castvote: 1});
$scope.castvoteTwo = $filter('filter')($scope.results, {castvote: 2});
To achieve this grouping, employ the Array.prototype.reduce function along with a hash table. This will help organize the array into an object where the key represents the castvote, and the value contains the elements associated with that specific castvote.
You can then access the result for a particular castvote by using result[castvote]
Check out the demo provided below:
var array=[{__v:0,_id:"5835ced6ffb2476119a597b9",castvote:1,time:"2016-11-23T17:16:06.676Z",userid:"57e0fa234f243f0710043f8f"},{__v:0,_id:"5835ced6ffb2476119a597b9",castvote:2,time:"2016-11-23T17:16:06.676Z",userid:"57e0fa234f243f0710043f8f"},{__v:0,_id:"5835ced6ffb2476119a597b9",castvote:1,time:"2016-11-23T17:16:06.676Z",userid:"57e0fa234f243f0710043f8f"}]
var result = array.reduce(function(hash){
return function(p,c) {
if(!hash[c.castvote]) {
hash[c.castvote] = [];
p[c.castvote] = hash[c.castvote];
}
hash[c.castvote].push(c);
return p;
};
}(Object.create(null)),{});
// use result[castvote] to get the result for that castvote
console.log(result);.as-console-wrapper{top:0;max-height:100%!important;}In accordance with the recommendations made here
One option is to utilize Underscore's groupby function to categorize items based on a specific property.
_.groupBy($scope.results, "castvote")
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