Set a default parameter value for a JavaScript function - Stack Overflow There are a lot of ways, but...

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Set a default parameter value for a JavaScript function - Stack Overflow



There are a lot of ways, but this is my preferred method - it lets you pass in anything you want, including false or null. (typeof null == "object")

function foo(a, b)

{

a = typeof a !== 'undefined' ? a : 42;

b = typeof b !== 'undefined' ? b : 'default_b';

...

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Set a default parameter value for a JavaScript function - Stack Overflow

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