How do I set the default value for an optional argument in Javascript

Question

I am writing a Javascript function with an optional argument  and I want to assign the optional argument a default value  How can I assign it a default value   I thought it would be this  but it doesn t work   function nodeBox str    hai

User · Accepted Answer

If str is null  undefined or 0  this code will set it to  hai   function nodeBox  str      str   str     hai           If you also need to pass 0  you can use   function nodeBox  str      if  typeof str      undefined     str     null         str    hai

User · Answer

You can also do this with ArgueJS   function       arguments       nodebox  undefined  str   String   hai           and now on  you can access your arguments by        arguments nodebox and arguments str

User · Answer

ES6 Update - ES6  ES2015 specification  allows for default parameters  The following will work just fine in an ES6  ES015  environment     function nodeBox  str  hai

[javascript] How do I set the default value for an optional argument in Javascript?

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