Filtering an array of objects by a specific parameter in JavaScript

Question

Filtering an array of objects by a specific parameter in JavaScript

I am working with a variable that contains an array of comments.

$scope.numOfCommentsCoupon

What I want to do is create a variable that counts the number of comments in the array that have a specific "couponId" value.

Here is the structure of the Comment Model:

    var CommentSchema = new Schema({

    created: {
        type: Date,
        default: Date.now
    },
    couponId: {
        type: String,
        trim: true
    }

});

I need to filter through the array and then calculate the count, but I'm unsure of how to accomplish this.

javascript arrays

Answer 1

Answer №1

One way to handle an array of comments is by utilizing the following code snippet

let total = 0;
comments.filter(function(response, position, group){
    if (response.promoCode === "special_offer") {
        total++;
    }
});

If preferred, you can also loop through the comments with a for loop. It's a simple method to execute.

Answer 2

One way to handle an array of comments is by utilizing the following code snippet

let total = 0;
comments.filter(function(response, position, group){
    if (response.promoCode === "special_offer") {
        total++;
    }
});

If preferred, you can also loop through the comments with a for loop. It's a simple method to execute.

Answer 3

Answer №2

It seems like I understand the concept you're aiming for, and one way to achieve it is by utilizing array.filter

Here's an example code snippet:

var targetCouponId = 1;
var results = yourArray.filter(function (item) { return item.couponId === 1; });
console.log(results.length);

Answer 4

It seems like I understand the concept you're aiming for, and one way to achieve it is by utilizing array.filter

Here's an example code snippet:

var targetCouponId = 1;
var results = yourArray.filter(function (item) { return item.couponId === 1; });
console.log(results.length);

Answer 5

Answer №3

To find the count of coupons with a specific couponId in an array, you can utilize the reduce method:

const items = [
    {
        couponId : "xyz"
    },
    {
        couponId : "abc"
    }
];

const targetCouponId = 'abc';

const totalCount = items.reduce(function(previousCount, currentItem) {
    return currentItem.couponId === targetCouponId ? previousCount + 1: previousCount;
}, 0);

console.log(totalCount);

Answer 6

To find the count of coupons with a specific couponId in an array, you can utilize the reduce method:

const items = [
    {
        couponId : "xyz"
    },
    {
        couponId : "abc"
    }
];

const targetCouponId = 'abc';

const totalCount = items.reduce(function(previousCount, currentItem) {
    return currentItem.couponId === targetCouponId ? previousCount + 1: previousCount;
}, 0);

console.log(totalCount);

Filtering an array of objects by a specific parameter in JavaScript

Answer №1

Answer №2

Answer №3

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