JavaScript's type coercion can catch developers off guard; for instance, concatenating an empty array with another empty array results in an empty string, which is not intuitive.
Understanding hoisting is crucial; while JavaScript moves variable declarations to the top, only declarations are hoisted, leading to potential undefined values if not properly initialized.
The peculiar behavior of NaN being classified as a number can confuse many. It's essential to grasp that JavaScript recognizes NaN as a numeric value despite its name.
When using '==' for comparison, JavaScript performs type coercion which can lead to unexpected results. For instance, an empty array evaluates to false, illustrating the subtleties of these operations.
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