https://github.com/diversen/is-defined-eval

Evaluates if a variable is defined
https://github.com/diversen/is-defined-eval

Last synced: 22 days ago
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Evaluates if a variable is defined

• Host: GitHub
• URL: https://github.com/diversen/is-defined-eval
• Owner: diversen
• Created: 2017-01-15T12:48:11.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2017-01-19T22:46:11.000Z (over 9 years ago)
• Last Synced: 2025-10-27T05:04:10.645Z (9 months ago)
• Language: JavaScript
• Size: 1.95 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# is-defined-eval

Checks if a variable is defined.

(Eval)uates a variable `identifier` like this: 

	'typeof ' + identifier + ' !== "undefined"'

Consider it as a shortcut to the above.

Example (on nodejs in console): 

~~~js

const isDefined = require('is-defined-eval');

var exportsExists = isDefined('exports');

console.log(exportsExists); // => true

var windowExists = isDefined('window');

console.log(windowExists); // => false

var documentExists = isDefined('document');

console.log(documentExists); // => false

~~~

License MIT