re: 3 Ways to Set Default Value in JavaScript VIEW POST


Given that your "ouchy" if/elses are only checking for truthiness, you'd miss out the a = a; part in the real world, though.

// ✅ If/Else is much better
if (a) {
  a = a;
  // do something else
} else {
  a = b;

becomes just this:

if (!a) {
  a = b;

and copes with specific tests like:

if (a === undefined) {
  a = b;

and that doesn't seem long or awkward to me; it seems explicit and readable.
Personally, I like the Elvis style (though it looks more like Jonny Bravo to me...) or the null coalescing operator you have in other languages (like SQL and nowadays even PHP), which has the benefit of being chainable like the || method.

// ✅ Ternary works # Ternary does not work.
a = (a === undefined) ? a : b;

The code in this segment is backwards - you're setting a to a only if it is undefined, and using b in all other cases.

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