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Grokking the Coding Interview Patterns in JavaScript

Solution: Integer to English Words

Explore how to convert integers into English words by understanding number segments like units, tens, hundreds, thousands, millions, and billions. Learn to apply a systematic approach to translate numbers within the 0 to 2,147,483,647 range into words, developing skills useful for coding interviews and real-world problems.

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Statement

Given a nonnegative integer, num, convert it to its English word representation.

Constraints:

  • 0≤0 \le num ≤231−1\le 2^{31}-1

Solution

To solve this problem, we need to understand the different types of words that can appear in the word representation of a number, which depend on three factors:

  1. Digits: There are ten digits ranging from 0 to 9.

  2. Number of digits: In our case, the maximum number of digits could be 1010 because the input number, num, will be in the range [0, 2147483647].

  3. Positional values: The positional value, also known as place value, of a digit can be ones (units), tens, hundreds, thousands, ten thousands, hundred thousands, millions, ten millions, hundred millions, or billions.

Based on these factors, numbers in different ranges have specific word representations. Here’s a general workflow for converting numbers to their word representation:

  1. Numbers from 00 ...