javascript sum of array
const sum = arr => arr.reduce((a, b) => a + b, 0);
javascript sum of array
const sum = arr => arr.reduce((a, b) => a + b, 0);
creating array of objects usinng reduce js
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]};
}, {});
javascript reduce
var array = [36, 25, 6, 15];
array.reduce(function(accumulator, currentValue) {
return accumulator + currentValue;
}, 0); // 36 + 25 + 6 + 15 = 82
reduce()
const array1 = [1, 2, 3, 4];
const reducer = (accumulator, currentValue) => accumulator + currentValue;
// 1 + 2 + 3 + 4
console.log(array1.reduce(reducer));
// expected output: 10
// 5 + 1 + 2 + 3 + 4
console.log(array1.reduce(reducer, 5));
// expected output: 15
js reduce
Sum array elements:
let myArr = [1,2,3,-1,-34,0]
return myArr.reduce((a,b) => a + b,0)
javascript reduce
const sum = array.reduce((accumulator, element) => {
return accumulator + element;
}, 0);
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