reduce javascript sum code example
Example 1: javascript reduce sum
arrSum = function(arr){ return arr.reduce(function(a,b){ return a + b }, 0);}
Example 2: javascript reduce sum
let nums = [1, 2, 3];
nums.reduce((curr, next) => curr + next);
Example 3: 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 4: .reduce mdn
arr.reduce(callback( accumulator, currentValue[, index[, array]] )[, initialValue])
Example 5: reduce javascript
const sum = array.reduce((accumulator, element[, idx[, sourceArray]]) => {
return accumulator + idx * 2 + element
}, 0);