I have a array with objects like this:
{
__v: 0,
_id: "5835ced6ffb2476119a597b9",
castvote: 1,
time: "2016-11-23T17:16:06.676Z",
userid: "57e0fa234f243f0710043f8f"
}
How can I make a new array that would filter them by the castvote - like an array containing the objects where castvote is 1, and one where castvote is 2?
You can do this in controller using $filter,
$scope.castvoteOne = $filter('filter')($scope.results, {castvote: 1});
$scope.castvoteTwo = $filter('filter')($scope.results, {castvote: 2});
You can use Array.prototype.reduce and a hash table to group the array into an object with key as the castvote and value as the elements that have that particular castvote.
Now you can use result[castvote] to get the result for that particular castvote
See demo 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;}As suggested here
You can use Underscore's groupby to do this generically by the type you want.
_.groupBy($scope.results, "castvote")
