query: What's the simplest approach to check existence of deeply-nested object property in JavaScript?
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positive_passages.text: Test for existence of nested JavaScript object key
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negative_passages.text: fastest way to detect if a value is in a group of values in Javascript
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negative_passages.text: Force JavaScript exception/error when reading an undefined object property?
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negative_passages.text: Reliable way to get the "ancestor" of an object with a specific classname, using jQuery
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negative_passages.text: Access object child properties using a dot notation string
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negative_passages.text: Is it possible to add dynamically named properties to JavaScript object?
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negative_passages.text: How to set object property (of object property of..) given its string name in JavaScript?
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negative_passages.text: Is there a built-in function to print all the current properties and values of an object?
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negative_passages.text: How to check if element has any children in Javascript?
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negative_passages.text: How do I check for nulls in an '==' operator overload without infinite recursion?
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negative_passages.text: How do I check if an object's type is a particular subclass in C++?
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negative_passages.text: How to efficiently count the number of keys/properties of an object in JavaScript?
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negative_passages.text: How can I check for "undefined" in JavaScript?
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negative_passages.text: How to get a subset of a javascript object's properties
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negative_passages.text: What is the most ruby-ish way of accessing nested hash values at arbitrary depths?
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negative_passages.text: Does JavaScript have an implementation of a set data structure?
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negative_passages.text: Most efficient way to see if an ArrayList contains an object in Java