Run results for: array to obj by key value

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36

Browser: Chrome 83

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
one liner	45847.1 Ops/sec
reduced	297678.1 Ops/sec

Tests:

one liner
const peopleArray = [ { id: 123, name: "dave", age: 23 }, { id: 456, name: "chris", age: 23 }, { id: 789, name: "bob", age: 23 }, { id: 101, name: "tom", age: 23 }, { id: 102, name: "tim", age: 23 } ] const arrayToObject = (arr, keyField) => Object.assign({}, ...arr.map(item => ({[item[keyField]]: item}))) const peopleObject = arrayToObject(peopleArray, "id")
reduced
const peopleArray = [ { id: 123, name: "dave", age: 23 }, { id: 456, name: "chris", age: 23 }, { id: 789, name: "bob", age: 23 }, { id: 101, name: "tom", age: 23 }, { id: 102, name: "tim", age: 23 } ] const arrayToObject = (array, keyField) => array.reduce((obj, item) => { obj[item[keyField]] = item return obj }, {}) const peopleObject = arrayToObject(peopleArray, "id")