Guard
Guard is a simple type checker function that aims to make it easier to check the types of arguments or values in a function. When a guard finds an invalid value it throws an error. The error thrown has a modified stack trace that originates from where guard was called to make for easier debugging.
npm install type-guard
var guard = ; { ; console;} ;// Hello Robert ;// GuardError: name must be a string// at hello (/Users/user/Developer/JS/hello.js:14:3)// at Object.<anonymous> (/Users/user/Developer/JS/hello.js:18:1)// at Module._compile (module.js:456:26)// at Object.Module._extensions..js (module.js:474:10)// at Module.load (module.js:356:32)// at Function.Module._load (module.js:312:12)// at Function.Module.runMain (module.js:497:10)
Docs
guard()
guard(string:key, *:val, string:type) => undefined
The guard function accepts a key, the name of your argument, a value, the
argument itself, and a type. The supported types are object
, string
,
boolean
, number
, array
, regexp
, date
, function
, null
, and
undefined
.