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Simplified and sped up the "type-function" example. #83

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merged 1 commit into from Aug 7, 2013
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Simplified and sped up the "type-function" example. #83

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24 changes: 14 additions & 10 deletions chapters/classes_and_objects/type-function.md
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Expand Up @@ -12,16 +12,20 @@ You'd like to know the type of a object without using typeof. (See http://javasc
Use the following function:

{% highlight coffeescript %}
type = (obj) ->
if obj == undefined or obj == null
return String obj
classToType = new Object
for name in "Boolean Number String Function Array Date RegExp".split(" ")
classToType["[object " + name + "]"] = name.toLowerCase()
myClass = Object.prototype.toString.call obj
if myClass of classToType
return classToType[myClass]
return "object"
type = (obj) ->
if obj == undefined or obj == null
return String obj
classToType = {
'[object Boolean]': 'boolean',
'[object Number]': 'number',
'[object String]': 'string',
'[object Function]': 'function',
'[object Array]': 'array',
'[object Date]': 'date',
'[object RegExp]': 'regexp',
'[object Object]': 'object'
}
return classToType[Object.prototype.toString.call(obj)]
{% endhighlight %}

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