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How to group objects based on a value in JavaScript?
Following is the code to group objects based on a value in JavaScript −
Example
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Document</title> <style> body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .result { font-size: 18px; font-weight: 500; color: rebeccapurple; } </style> </head> <body> <h1>Group objects based on a value in JavaScript</h1> <div class="result"> { name: 'Rohan', age: 18 }, { name: 'Mohan', age: 20 }, { name: 'Shawn', age: 18 }, { name: 'Michael', age: 18 }, { name: 'David', age: 20 } </div> <button class="Btn">CLICK HERE</button> <h3>Click on the above button to group the above object based on people's age</h3> <script> let resEle = document.querySelector(".result"); let sampleEle = document.querySelector(".sample"); let BtnEle = document.querySelector(".Btn"); const people = [ { name: "Rohan", age: 18 }, { name: "Mohan", age: 20 }, { name: "Shawn", age: 18 }, { name: "Michael", age: 18 }, { name: "David", age: 20 }, ]; let groupBy = (array, key) => { return array.reduce((result, obj) => { (result[obj[key]] = result[obj[key]] || []).push(obj); return result; }, {}); }; let a = groupBy(people, "age"); BtnEle.addEventListener("click", () => { console.log(a); }); </script> </body> </html> Output
The above code will produce the following output −
On clicking the ‘CLICK HERE’ button and inspecting the console −
Updated on: 2020-07-21T07:00:19+05:30
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