Generics
Generic & Mutating (diff in Any)
class Stack<T> {
var arr: [T] = []
func push(_ item: T) {
arr.append(item)
}
func remove(at index: Int) {
arr.remove(at: index)
}
}
let stack_1 = Stack<Int>()
stack_1.push(5)
stack_1.remove(at: 0)
SubString in Swift
extension String { func index (from: Int ) -> Index { return self . index ( startIndex , offsetBy: from) } func substring (from: Int ) -> String { let fromIndex = index (from: from) return String ( self [fromIndex ... ]) } func substring (to: Int ) -> String { let toIndex = index (from: to) return String ( self [ ..< toIndex]) } func substring (with r: Range < Int >) -> String { let startIndex = index (from: r. lowerBound ) let endIndex = index (from: r. upperBound ) return String ( self [startIndex ..< endIndex]) } func subString (from index: Int , count: Int ) -> String...
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