elif let statements

[Chriscbr]

Feature Spec

Support if let in the "elif" position:

let x = Json { ghost: "spooky" };
if let y = x.tryAsBool() {
  log("it's a boolean!");
} elif let y = x.tryAsNum() {
  log("it's a number!");
} else {
  log("it's something else!");
}

Use Cases

Checking and unwrapping values without separate if statements

Implementation Notes

No response

Component

Compiler

Community Notes

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[MarkMcCulloh]

I think this helps point out the strangeness/inconsistency of having elif instead of else if. I know consistency here would help me personally remember the control flow syntax because it's just logical combinations of three keywords rather than having a fourth one that you use sometimes:

if let y = x.tryAsBool() {
  log("it's a boolean!");
} elif let y = x.tryAsNum() {
  log("it's a number!");
} else {
  log("it's something else!");
}

vs

if let y = x.tryAsBool() {
  log("it's a boolean!");
} else if let y = x.tryAsNum() {
  log("it's a number!");
} else {
  log("it's something else!");
}

[marciocadev]

🤣🤣🤣🤣 I just finished implementing a branch for this, and now I'm not sure if I should push it.

I will submit the pull request if there are changes in the 'elif' naming; the implementation is already done, there would be few changes to be made

[staycoolcall911]

Done in #3888