_.isNaN

isNaN_.isNaN(object)
Returns true if object is NaN.
Note: this is not the same as the native isNaN function, which will also return true for many other not-number values, such as undefined.

_.isNaN(NaN);
=> true
isNaN(undefined);
=> true
_.isNaN(undefined);
=> false

Links:

http://underscorejs.org/index#isNaN

doc_Underscore

2016-04-09 09:05:27

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