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December 29, 2015 07:49
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Checking types.
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// Props to : http://techblog.badoo.com/blog/2013/11/01/type-checking-in-javascript/ | |
var type = function (o) { | |
// handle null in old IE | |
if (o === null) { | |
return 'null'; | |
} | |
// handle DOM elements | |
if (o && (o.nodeType === 1 || o.nodeType === 9)) { | |
return 'element'; | |
} | |
var s = Object.prototype.toString.call(o); | |
var type = s.match(/\[object (.*?)\]/)[1].toLowerCase(); | |
// handle NaN and Infinity | |
if (type === 'number') { | |
if (isNaN(o)) { | |
return 'nan'; | |
} | |
if (!isFinite(o)) { | |
return 'infinity'; | |
} | |
} | |
return type; | |
}; | |
['Null', | |
'Undefined', | |
'Object', | |
'Array', | |
'String', | |
'Number', | |
'Boolean', | |
'Function', | |
'RegExp', | |
'Element', | |
'NaN', | |
'Infinite' | |
].forEach(function (t) { | |
type['is' + t] = function (o) { | |
return type(o) === t.toLowerCase(); | |
}; | |
}); |
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