Q:
How to Set Default Parameter Value for a JavaScript Function
belongs to collection: JavaScript / jQuery Frequently Asked Questions
JavaScript / jQuery Frequently Asked Questions
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JavaScript programming
Use the Assign (
=) OperatorWe all know that in JavaScript, function parameters default to
undefined. However, it is often useful to specify a different default value for the parameter. Since ES6, you can simply use the assign (=) operator to set a default value for a function parameter in JavaScript.In the following example the default parameter value
need an explanation for this answer? contact us directly to get an explanation for this answer"There"will be used if the functionsayHi()is called without an argument. Let's try it out to understand how it basically works: