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JavaScript GROUP BY Function with Example

Today, We want to share with you JavaScript GROUP BY Function with Example.In this post we will show you group by filter in javascript, hear for Group Array of JavaScript Objects by Key or Property Value we will give you demo and example for implement.In this post, we will learn about javascript group by multiple properties with an example.

JavaScript GROUP BY Function with Example

There are the Following The simple About JavaScript GROUP BY Function with Example Full Information With Example and source code.

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As I will cover this Post with live Working example to develop javascript array group by sum, so the json group by key javascript for this example is following below.

javascript group by multiple properties

Below source code is a javascript helper function We can use to take simple products data an array and group by a key.

const groupBy = function (data, key) {
    return data.reduce(function (itemArr, el) {
        var group = el[key];

        if (itemArr[group] === undefined) {
            itemArr[group] = []
        }

        itemArr[group].push(el)
        return itemArr
    }, {})
}

export {
    groupBy
}

We May use this on Products arrays by passing in Data array with the key We want to group on.

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let products_data = [
    { name: "Product 1", value: 15 },
    { name: "Product 1", value: 41 },
    { name: "Product 2", value: 95 },
    { name: "Product 2", value: 88 }
]

console.log( groupBy(products_data, 'name') )

This javascript will output the new array Like as below

[
   "Product 1" : [
       { name: "Product 1", value: 15 },
       { name: "Product 1", value: 41 },
   ],
   "Product 2" : [
       { name: "Product 2", value: 95 },
       { name: "Product 2", value: 88 }
   ],
]

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