30-seconds-of-code/snippets/hasFlags.md

title, tags, expertise, cover, firstSeen, lastUpdated

title	tags	expertise	cover	firstSeen	lastUpdated
Check if process arguments contain flags	node	intermediate	blog_images/white-tablet.jpg	2018-01-01T18:24:43+02:00	2020-10-22T20:23:47+03:00

Checks if the current process's arguments contain the specified flags.

• Use Array.prototype.every() and Array.prototype.includes() to check if process.argv contains all the specified flags.
• Use a regular expression to test if the specified flags are prefixed with - or -- and prefix them accordingly.

const hasFlags = (...flags) =>
  flags.every(flag =>
    process.argv.includes(/^-{1,2}/.test(flag) ? flag : '--' + flag)
  );

// node myScript.js -s --test --cool=true
hasFlags('-s'); // true
hasFlags('--test', 'cool=true', '-s'); // true
hasFlags('special'); // false