Question 1

How to parse yes/no strings in Node.js?

Accepted Answer

Install yn via npm, then import and call yn('input'). It returns true for 'y', 'yes', etc., false for negatives, or undefined/ default for unmatched values, handling common cases automatically.

Question 2

yn vs using Boolean() for parsing boolean strings?

Accepted Answer

yn is more robust for human input, handling variations like 'yes' and typos, while Boolean() only treats non-empty strings as true. Use yn for CLI or config parsing where user error is likely.

Question 3

How to handle typos in user input for booleans with yn?

Accepted Answer

Enable lenient mode by passing {lenient: true} as an option. This uses key distance scoring to accept close matches, so 'yse' might parse as true, improving usability in interactive tools.

Question 4

Does yn work with TypeScript?

Accepted Answer

Yes, yn has full TypeScript support with typed functions and options. Importing it in a TypeScript project provides autocomplete and type checking, reducing runtime errors.

Question 5

Can yn parse values like 'maybe' or custom strings?

Accepted Answer

No, yn only recognizes predefined values like 'yes' and 'no'. For custom strings, you'll need to handle them separately or use the default option to fall back to a boolean value.

Question 6

How to set a default value when yn parsing fails?

Accepted Answer

Pass a default option, e.g., yn('invalid', {default: false}), to return false instead of undefined. This is useful for configuration files where a missing value should have a predictable boolean.

yn

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