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Determine if object is integer
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Checking if a key exists in a JavaScript object?
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How to get a JavaScript object's class?
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Get the name of an object's type
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In Python, how do I determine if an object is iterable?
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How to Check for a Specific Type of Object in PHP
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How is a Javascript string not an object?
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Serializing an object to JSON
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Detecting an undefined object property
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best way to get the key of a key/value javascript object
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How do I get started working with JSON in Apex?
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How to access object properties containing special characters?
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How to detect if a variable is an array
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How can I check whether a variable is defined in JavaScript?
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How to find out if an Object is a collection or single value?
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How to check whether a variable is a class or not?