javascript - how to get size or count the number of properties of an object? -


this question has answer here:

is there method count number of properties (or size) of object (don't want use loop) ?

suppose have object obj as,

obj={id:'0a12',name:'nishant',phone:'mobile'};

then there method results 3 in case ?

object.keys returns array containing names of object's own enumerable properties, so:

var count = object.keys(obj).length;

note there may loop involved (within object.keys), @ least it's within javascript engine. object.keys added es5, older browsers may not have (it can "shimmed," though; search "es5 shim" options).

note that's not quite same list of properties for-in iterates, for-in includes properties inherited prototype.

i don't believe there's way list of object's non-enumerable properties (that point of them!).


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