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optimist

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optimist

Light-weight option parsing with an argv hash. No optstrings attached.


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1.8M
decreased by-21.14%
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What is optimist?

The optimist npm package is a command-line option parser for Node.js. It allows developers to parse arguments passed to their Node.js applications and use them as options within the application. It provides a simple and fluent API to define and access command-line arguments.

What are optimist's main functionalities?

Option Parsing

This feature allows the parsing of command-line arguments. In the code sample, optimist is used to parse the 'name' argument from the command line and print a greeting message.

const argv = require('optimist').argv;
console.log('Hello, ' + argv.name + '!');

Default Values

This feature allows setting default values for command-line arguments. In the code sample, if the 'name' argument is not provided, it defaults to 'World'.

const argv = require('optimist').default('name', 'World').argv;
console.log('Hello, ' + argv.name + '!');

Demand Options

This feature makes certain command-line arguments mandatory. In the code sample, the 'name' argument is required, and the script will not run without it.

const argv = require('optimist').demand(['name']).argv;
console.log('Hello, ' + argv.name + '!');

Usage Messages

This feature allows developers to provide usage messages for their command-line applications. In the code sample, a usage message is defined to guide the user on how to run the script.

const argv = require('optimist').usage('Usage: $0 --name [name]').argv;
console.log('Hello, ' + argv.name + '!');

Boolean Flags

This feature allows the definition of boolean flags. In the code sample, a 'verbose' flag is defined, which can be turned on or off.

const argv = require('optimist').boolean('verbose').argv;
console.log('Verbose mode is ' + (argv.verbose ? 'on' : 'off'));

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Package last updated on 06 Feb 2014

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