JavaScript: map, filter and reduce

A short, tested JavaScript example for map, filter and reduce. Copy it and adjust the names and paths for your project.

JavaScript

const nums = [1, 2, 3, 4];

const doubled = nums.map(n => n * 2);          // [2, 4, 6, 8]
const evens = nums.filter(n => n % 2 === 0);   // [2, 4]
const sum = nums.reduce((a, n) => a + n, 0);   // 10

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