Check if a string can be used as a JavaScript variable name
npm install is-var-name
Check if a string can be used as a JavaScript variable name
``javascript`
isVarName('foo'); //=> true
isVarName('f o o'); //=> false
`
npm install is-var-name
`javascript`
import isVarName from 'is-var-name';
name: string boolean
Return:
It returns true if the string can be used as a valid JavaScript identifier name. If not, or the argument is not a string, it returns false.
`javascript
isVarName('______________'); //=> true
isVarName('å'); //=> true
isVarName('123'); //=> false
isVarName('↑→↓←'); //=> false
isVarName('_;'); //=> false
isVarName(''); //=> false
isVarName(['foo']); //=> false
isVarName(); //=> false
`
Instead of this module, you can use the regular expression that matches valid variable names.
is-var-name uses Function constructor but regular expression doesn't.
According to the ESLint documentation, new Function()` is:
> considered by many to be a bad practice due to the difficult in debugging and reading these types of functions.
Since the regular expression is too long (about 16,000 characters), it increases the file size of your library or application.
ISC License © 2018 Shinnosuke Watanabe