I have a variable which is an array of comments.
$scope.numOfCommentsCoupon
What i would like to have is a variable which is a count of the Comments inside the array that have a "couponId" of a certain value.
Here is the Comment Model
var CommentSchema = new Schema({
created: {
type: Date,
default: Date.now
},
couponId: {
type: String,
trim: true
}
});
So i need to filter it and then count it but im not sure how to.
If you have an array of comments, to do that, you could do something like this
var count = 0;
comments.filter(function(comment,index,array){
if (comment.couponId === "some_value") {
count++;
}
});
Or you could just iterate over it using the for loop. Pretty straightforward stuff to implement
I think I follow what you're trying to do and you can use array.filter
It would look like this:
var currentCouponId = 1;
var matching = yourArray.filter(function (element) { return element.couponId == 1; });
console.log(matching.length);
Youd could use reduce method on the array to get the count of coupons whose couponId is equals to a given string:
var comments = [
{
couponId : "1"
},
{
couponId : "2"
}
];
var couponIdToCount = "2";
var count = comments.reduce(function(previous, current) {
return current.couponId == couponIdToCount ? previous + 1: previous;
}, 0);
console.log(count)
