Introduction to is-glob

The is-glob library is a versatile and efficient glob pattern-matching utility for JavaScript. It helps developers identify whether a string contains a glob pattern. This is particularly useful when working with file systems and directories, where pattern matching is often required.

What is a Glob Pattern?

A glob pattern is a string that includes wildcards and special characters to match file names or paths. Common characters include * for matching any number of characters, ? for matching a single character, and [] for matching a range of characters.

is-glob API Overview

The is-glob library provides simple and efficient functions to determine if a given string is a glob pattern.

Basic Usage

  
  const isGlob = require('is-glob');

  console.log(isGlob('*.js')); // true
  console.log(isGlob('!*.js')); // true
  console.log(isGlob('index.js')); // false
  

Advanced Examples

  
  // Using with arrays
  const patterns = ['*.js', 'readme.md', '!package.json'];
  patterns.forEach(pattern => {
    console.log(`${pattern} is a glob: ${isGlob(pattern)}`);
  });

  // Output
  // *.js is a glob: true
  // readme.md is a glob: false
  // !package.json is a glob: true

  // Checking if directories are globs
  console.log(isGlob('src/**/*.js')); // true
  console.log(isGlob('src/')); // false
  

App Example Using is-glob

Let’s create a simple Node.js application that categorizes input patterns into glob and non-glob.

  
  const isGlob = require('is-glob');

  const patterns = ['src/*.js', 'src/app.js', 'package.json', 'readme.md', '!*spec.js'];
  const globPatterns = [];
  const nonGlobPatterns = [];

  patterns.forEach(pattern => {
    if (isGlob(pattern)) {
      globPatterns.push(pattern);
    } else {
      nonGlobPatterns.push(pattern);
    }
  });

  console.log('Glob Patterns: ', globPatterns);
  console.log('Non-Glob Patterns: ', nonGlobPatterns);

  // Output
  // Glob Patterns:  [ 'src/*.js', '!*.js' ]
  // Non-Glob Patterns:  [ 'src/app.js', 'readme.md' ]
  

With the above example, you can see how easy it is to categorize patterns using is-glob. This utility can be extremely helpful when you’re dealing with file system operations, ensuring that you can easily differentiate and handle glob patterns appropriately.

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