Good evening! Here's our prompt for today.

Can you convert a number to its text equivalent? This is otherwise known as number spelling.

For example, given 1234, we expect to get "one thousand two hundred and thirty four" back.

Constraints

• The given number will have <= 100 digits
• Let n be the number of digits
• Expected time complexity : O(n)
• Expected space complexity : O(n)

Try to solve this here or in Interactive Mode.

How do I practice this challenge?

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var assert = require('assert');

​

function numberToWords(n) {

  // convert n to words

  return n;

}

​

try {

  assert.equal(numberToWords(1234), 'one thousand two hundred and thirty four');

​

  console.log(

    'PASSED: ' +

      "assert.equal(numberToWords(1234), 'one thousand two hundred and thirty four');"

  );

} catch (err) {

  console.log(err);

}

​

We'll now take you through what you need to know.

How do I use this guide?