vm.fetchData = ($index) => {
}
I want to make $index as optional parameter.
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1Don't pass the parameter when you call the function?Heretic Monkey– Heretic Monkey2021-07-08 16:32:47 +00:00Commented Jul 8, 2021 at 16:32
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If this is just vanilla JS, then you don't have a concept of a function signature that automatically enforces input-- if a function is invoked without parameters passed, the function will execute until it completes or it encounters an error (likely as a result of the missing parameter)-- there is no runtime check in which it will automatically error out from parameters being omitted that it was somehow "expecting".Alexander Nied– Alexander Nied2021-07-08 16:37:00 +00:00Commented Jul 8, 2021 at 16:37
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1Since AngularJS is using vanilla JS: Does this answer your question? In JavaScript, how can I create a function with an optional parameter?hc_dev– hc_dev2021-07-08 18:01:42 +00:00Commented Jul 8, 2021 at 18:01
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1 Answer
Since you don't explicitly can declare parameters as optional in vanilla JS, you could simply ignore them in the function body:
vm.fetchData = function($index) {
if(typeof $index == 'undefined') {
// following should happen if parameter is missing
} else {
// following requires a parameter
}
// do the rest and return
}
See also:
