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JavaScript Brain Teasers: Exercise Your Mind

Discussion: The Arrayist

Explore a concise JavaScript technique to generate arrays with numbers from 1 to n by combining arrow functions, the spread operator, and the map method. Understand how each part works together to transform empty arrays into useful numeric sequences and enhance your functional programming skills.

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Verifying the output

Now, it’s time to execute the code and observe the output.

Javascript (babel-node)
const f = (n) => [...Array(n)].map((_, i) => i + 1);
console.log(f(20));

Understanding the output

This puzzle reveals a super concise method to generate an array of numbers from 1 to n using the powerful combination of arrow functions, the spread operator, and the map() method. ...