API tools faq
paste
xerocool-101

001 reduce method

xerocool-101
Apr 19th, 2025 (edited)
53
0
Never
Add comment
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
JavaScript 1.14 KB | Software | 0 0
raw download clone embed print report
  1. // Total price
  2. const items = [
  3.   { name: 'Apple', price: 1 },
  4.   { name: 'Orange', price: 2 },
  5.   { name: 'Mango', price: 3 },
  6. ];
  7.  
  8. const totalPrice = items.reduce((accumulator ,item, index, array) => {
  9.   return accumulator += item.price;
  10. }, 0)
  11.  
  12. console.log(totalPrice);
  13. // 6
  14.  
  15. // How to Group Similar Items Together
  16. const items = [
  17.   { name: 'Apple', category: 'Fruit' },
  18.   { name: 'Onion', category: 'Vegetable' },
  19.   { name: 'Orange', category: 'Fruit' },
  20.   { name: 'Lettuce', category: 'Vegetable' },
  21. ];
  22.  
  23. const groupedItems = items.reduce((accumulator, item) => {
  24.   const category = item.category;
  25.   if (!accumulator[category]) {
  26.     accumulator[category] = []
  27.   }
  28.   accumulator[category].push(item.name);
  29.   return accumulator
  30. }, {})
  31.  
  32. console.log(groupedItems);
  33. // { Fruit: [ 'Apple', 'Orange' ], Vegetable: [ 'Onion', 'Lettuce' ] }
  34.  
  35. // How to Remove Duplicates
  36. const items = [1, 2, 3, 1, 2, 3, 7, 8, 7];
  37.  
  38. const noDuplicateItems = items.reduce((accumulator, item) => {
  39.   if (!accumulator.includes(item)) {
  40.     accumulator.push(item);
  41.   }
  42.   return accumulator;
  43. }, []);
  44.  
  45. console.log(noDuplicateItems);
  46. // [ 1, 2, 3, 7, 8 ]
  47.  
Tags: JavaScript
Add Comment
Please, Sign In to add comment
Public Pastes
We use cookies for various purposes including analytics. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy.  OK, I Understand
Not a member of Pastebin yet?
Sign Up, it unlocks many cool features!