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| function stockAndCount(n, arr) { | |
| let pairs = 0; // pairs number | |
| const colors = arr.reduce((acc, val) => { | |
| acc[val] ? (acc[val] += 1) : (acc[val] = 1); | |
| return acc; | |
| }, {}); // return an object with colors (numbers) as keys and quantity as value | |
| Object.keys(colors).forEach((n) => { // for each key in colors | |
| let _pair = parseInt(colors[n] / 2); // looks for even numbers | |
| if (_pair >= 1) pairs += _pair; // total | |
| }); | |
| return pairs; | |
| } | |
| const n = 9; | |
| const socks = [10, 20, 20, 10, 10, 10, 10, 10, 20]; | |
| console.group('Stocked and counted'); | |
| console.log(`There is a total of ${stockAndCount(n, socks)} pairs`); | |
| console.groupEnd(); |
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