Question:
b' This question already has answers here: Detecting an undefined object property (50 answers) How to check a not-defined variable in JavaScript (15 answers) How to handle 'undefined' in JavaScript [duplicate] (3 answers) How can I check if a variable exist in JavaScript? (8 answers) Closed 7 years ago. What is the most appropriate way to test if a variable is undefined in JavaScript?I\'ve seen several possible ways:if (window.myVariable)Orif (typeof(myVariable) != "undefined")Orif (myVariable) // This throws an error if undefined. Should this be in Try/Catch? '
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