add missing parens

snippets/checkProp.md

@@ -12,7 +12,7 @@ const checkProp = (predicate, prop) => obj => !!predicate(obj[prop])
 const lengthIs4 = checkProp(l => l === 4, 'length')
 lengthIs4([]) // false
 lengthIs4([1,2,3,4]) // true
-lengthIs4(new Set([1,2,3,4]) // false (Set uses Size, not length)
+lengthIs4(new Set([1,2,3,4])) // false (Set uses Size, not length)
 
 const session = { user: {} }
 const validUserSession = checkProps(u => u.active && !u.disabled, 'user')