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By mswatcher
via 2ality.com
Submitted: Jan 21 2013 / 10:08

Categorizing values in JavaScript
This post examines four ways in which values can be categorized in JavaScript: via the hidden property [[Class]], via the typeof operator, via the instanceof operator and via the function Array.isArray(). We’ll also look at the prototype objects of built-in constructors, which produce unexpected categorization results.
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