Swift Style

Hugging Parentheses

Unlike bracing, Swift parentheses want to hug their contents. In Swift, most coders eliminate spaces next to parentheses and square brackets. There’s no loss in readability because the parentheses act as the differentiating whitespace between successive elements.

print("x:", x) // yes
print( "x:", x ) // uncommon
let paddedCount = String(count).pad(to: 8) // yes
let paddedCount = String( count ).pad( to: 8 ) // uncommon

Some developers, like those influenced by jQuery, prefer space-padded parentheses. This is known as liberal spacing. Spaces emphasize the separation between internal components and their surrounding construct. It’s an uncommon style for Swift, but it is not an unreasonable one.

• Braces ...