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javascript/snippets/has-flags.md

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+---
+title: Check if process arguments contain flags
+type: snippet
+tags: [node]
+cover: white-tablet
+dateModified: 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.
+
+```js
+const hasFlags = (...flags) =>
+  flags.every(flag =>
+    process.argv.includes(/^-{1,2}/.test(flag) ? flag : '--' + flag)
+  );
+```
+
+```js
+// node myScript.js -s --test --cool=true
+hasFlags('-s'); // true
+hasFlags('--test', 'cool=true', '-s'); // true
+hasFlags('special'); // false
+```