Control Flow

Control flow in FScript is expression-oriented.

if

label = if (active) { 'enabled' } else { 'disabled' }

Both branches produce values, and the whole if expression produces a value too.

match

message = match (result) {
  { tag: 'ok', value } => 'value: ' + value
  { tag: 'error', error } => 'error: ' + error.message
}

match is the preferred tool for tagged unions and shape-based branching.

try/catch

safeRead = (path: String) => {
  try {
    FileSystem.readFile(path)
  } catch (error) {
    'fallback'
  }
}

Like other forms, try/catch is value-producing.

Comparison to JavaScript

JavaScript has these constructs too, but FScript leans much harder on them as expressions rather than statements. That makes them fit naturally inside pipelines, bindings, and helper functions.