Web Reference: Dec 31, 2009 · In JavaScript, the following values will cause the if condition to fail and not execute its statement: null, undefined, false, NaN, the number 0, and the empty string ''. A detailed article about 'undefined' keyword in JavaScript. 7 tips on how to handle correctly 'undefined' and increase code durability. Learn how to fix undefined errors in your code with clear explanations and effective debugging tips. Get expert solutions to common coding problems.
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