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December 11, 2015 09:19
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function typed (types, cb) { | |
if (Object.prototype.toString.call(types) === '[object Array]' && typeof cb === "function") { | |
return function () { | |
var i = arguments.length, areTypesCorrect = true; | |
while (i--) { | |
// need to check for some literals: string/number/boolean | |
var type = typeof arguments[i], arg; | |
if (type === 'string') { | |
arg = new String(); | |
} else if (type === 'number') { | |
arg = new Number(); | |
} else if (type === 'boolean') { | |
arg = new Boolean(); | |
} else { | |
arg = arguments[i]; | |
} | |
if ( ! (arg instanceof types[i]) ) { | |
areTypesCorrect = false; | |
throw new TypeError('Argument '+ (i+1) + ' "' + arguments[i] + '" is not an instance of "' + types[i] + '" '); | |
break; | |
} | |
} | |
areTypesCorrect && cb.apply(this, arguments); | |
} | |
} else { | |
throw new TypeError('(typed): arguments given are not valid'); | |
} | |
} | |
var myTypedFunction = typed([String, Array], function(str, arr) { | |
console.log(str, arr) | |
}); | |
// will work | |
myTypedFunction('hello', ['world']); | |
// will not work | |
myTypedFunction(false, ['world']); |
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