How Can Dictionaries Efficiently Convert Number Words to Integers?

Converting Number Words to Integers Efficiently with Dictionaries

In many situations, we encounter the need to convert written number words (e.g., "one") into their corresponding integers (e.g., 1). Libraries or classes can simplify this task.

One approach involves using a dictionary (known as numwords in the provided code) to map number words to their integer representations. This dictionary is set up only on the first function call.

As the code parses the input textnum (e.g., "seven billion one hundred million thirty one thousand three hundred thirty seven"), it uses the numwords dictionary to translate each word into its integer value.

For example, "seven" corresponds to 7, "billion" to 1000000000, and "one" to 1. The code accumulates these values, taking into account scales such as "hundred" and "thousand."

The function text2int effectively converts the input textnum into an integer result, handling all common number words efficiently. By leveraging a dictionary, this approach minimizes the need for lengthy case statements or complex regex patterns, making it a robust solution for number word conversion.

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