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@arielelkin
Forked from natecook1000/isNullOrEmpty.swift
Created February 17, 2021 16:57
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protocol StringType {
var isEmpty: Bool { get }
}
extension String : StringType { }
extension Optional where Wrapped: StringType {
var isNullOrEmpty: Bool {
return self?.isEmpty ?? true
}
}
extension Optional where Wrapped: CollectionType {
var isNullOrEmpty: Bool {
return self?.isEmpty ?? true
}
}
// Strings:
let strs: [String?] = [nil, "", "Hello!"]
for s in strs {
if s.isNullOrEmpty {
print("null or empty string: \(s)")
}
}
// Collections:
let colls: [[Int]?] = [nil, [], [1, 2, 3]]
for c in colls {
if c.isNullOrEmpty {
print("null or empty collection: \(c)")
}
}
let filtered = colls.map({ $0?.lazy.filter({ $0 > 3 }) })
for c in filtered {
if c.isNullOrEmpty {
print("null or empty filtered collection: \(c)")
}
}
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