I tried looking this up and did not find an answer. Is there any reason to use _ over () when passing in 0 parameters in an arrow function? Just asking out of curiosity.
// ...(() => {}) vs (_ => {})
ES6 Arrow Functions () vs _
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1 Answers
The differences are:
_creates an identifier for the_variable. (In rare circumstances, this may be confusing if one is using a library which assigns towindow._, like underscore.js)- Using
_means that parentheses aren't needed. (In contrast, declaring a function with zero arguments requires an empty parameter list with()) Some like saving on a character by using_instead.
(One could have, equivalently, used any other argument name like z which then goes unused - but the convention for an unused variable is to use _)
If one isn't using a library that assigns to window._, then the _ parameter won't shadow it, so both options work just fine. Feel free to choose whichever strikes your fancy.
Note that a common linting rule forbids the declaration of unused parameters, and will require () instead of _.
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