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  • #!/usr/bin/env node
    #!/usr/bin/env node
    'use strict';
     
    const { ArgumentParser } = require('argparse');
    const { version } = require('./package.json');
     
    const parser = new ArgumentParser({
      description: 'Argparse example'
    });
     
    parser.add_argument('-v', '--version', { action: 'version', version });
    parser.add_argument('-f', '--foo', { help: 'foo bar' });
    parser.add_argument('-b', '--bar', { help: 'bar foo' });
    parser.add_argument('--baz', { help: 'baz bar' });
     
    console.dir(parser.parse_args());
    Docs
  • import Mercury from '@postlight/mercury-parser';
    
    Mercury.parse(url).then(result => console.log(result));
    
    // NOTE: When used in the browser, you can omit the URL argument
    // and simply run `Mercury.parse()` to parse the current page.
    Docs
  • const parse5 = require('parse5');
    
    const documentFragment = parse5.parseFragment('<table></table>');
    
    console.log(documentFragment.childNodes[0].tagName); //> 'table'
    
    // Parses the html fragment in the context of the parsed <table> element.
    const trFragment = parser.parseFragment(documentFragment.childNodes[0], '<tr><td>Shake it, baby</td></tr>');
    
    console.log(trFragment.childNodes[0].childNodes[0].tagName); //> 'td'
    Docs
  • const tsAst = recast.parse(source, {
      parser: require("recast/parsers/typescript")
    });
    Docs
  • // Before rest parameters, "arguments" could be converted to a normal array using:
    
    function f(a, b) {
      let normalArray = Array.prototype.slice.call(arguments)
      // -- or --
      let normalArray = [].slice.call(arguments)
      // -- or --
      let normalArray = Array.from(arguments)
    
      let first = normalArray.shift()  // OK, gives the first argument
      let first = arguments.shift()    // ERROR (arguments is not a normal array)
    }
    
    // Now, you can easily gain access to a normal array using a rest parameter
    
    function f(...args) {
      let normalArray = args
      let first = normalArray.shift() // OK, gives the first argument
    }
    
    Docs
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