How to Convert Numbers to English Words in JavaScript: Why Does "190000009" Become "Nineteen Million"?

JavaScript: Converting Numbers to English Words

Introduction

Converting numbers into English words can be a useful task, with applications ranging from reporting numerical values to generating spoken descriptions. In JavaScript, achieving this conversion can be accomplished through a series of logical steps, as outlined in the provided code snippet.

Converting Digit Groups

The code breaks the number into groups of three digits, starting from the right and moving left. Each group is converted into a word representation using the triConvert function. This function handles numbers up to 999, returning a word representation or "dontAddBigSuffix" if all digits are zero.

Managing Larger Numbers

To handle larger numbers, the code uses an auxiliary array bigNumArry to add suffixes such as "thousand," "million," and "billion" based on the position of the digit group within the original number. If a digit group is all zeroes, it skips the suffix and sets the corresponding element in finlOutPut to an empty string.

The "Forgotten" Last Number

The initial issue described in the question, where some last digits were forgotten in conversions like "190000009," stemmed from a logical error. When encountering a digit group like "009," the code incorrectly assigned the empty string to the corresponding element in finlOutPut, effectively skipping over the last part of the number.

The Fix

To resolve this, the corrected code checks for all-zero digit groups and explicitly sets them to "dontAddBigSuffix" instead of the empty string. This ensures that subsequent logic properly handles these groups and adds the appropriate suffix.

Limitations

While the code effectively converts numbers within a certain range, it could be extended to handle larger numbers by adding more elements to the bigNumArry array or adopting a different approach that dynamically manages suffixes regardless of their position.

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