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Twittercan.hasKey
Define a function to determine key membership of an object or an object on its prototype chain
@@can.hasKey(key)
The @@can.hasKey symbol points to a function on an object that, given a String key, determines whether the key is a member of the object's key set or the key set of an object on its prototype chain.
var obj = {
secrets: [ "garden", "santa", "service" ]
};
obj[canSymbol('can.hasKey')] = function(key) {
return key in this || key in this.secrets;
};
Parameters
- key
{String}:the string key for which to test membership in the object
Returns
{Boolean}:
true if there is a property on the object or on an object in the objects prototype chain with a matching key, false otherwise.