reduce array to object javascript code example
Example 1: reduce object to array javascript
var arr = [{x:1},{x:2},{x:4}];
arr.reduce(function (a, b) {
return {x: a.x + b.x};
})
arr.reduce((a, b) => ({x: a.x + b.x}));
Example 2: reduce array to object javascript
const posts = [
{id: 1, category: "frontend", title: "All About That Sass"},
{id: 2, category: "backend", title: "Beam me up, Scotty: Apache Beam tips"},
{id: 3, category: "frontend", title: "Sanitizing HTML: Going antibactirial on XSS attacks"}
];
const categoryPosts = posts.reduce((acc, post) => {
let {id, category} = post;
return {...acc, [category]: [...(acc[category] || []), id]};
}, {});
Example 3: .reduce mdn
arr.reduce(callback( accumulator, currentValue[, index[, array]] )[, initialValue])