[英]Swift string compare characters
I am looking to compare a string that the user enters to 3 other strings. 我想将用户输入的字符串与其他3个字符串进行比较。 If the user entered string has any of the characters that the other strings contain I want to do one thing and if not something else
如果用户输入的字符串具有其他字符串包含的任何字符,我想做一件事,如果不是
case 1: string1 = abc string2 = abc string3 = abc 情况1:string1 = abc string2 = abc string3 = abc
userEnter = fgh
> since none of the letters match do one thing
case 2: string1 = abc string2 = fbc string3 = abc 情况2:string1 = abc string2 = fbc string3 = abc
userEnter = fgh
> one letter from userEnter is found in the other 3 strings do another thing...
Not sure how to compare strings in swift at all or how to access individual characters. 完全不知道如何快速比较字符串或如何访问单个字符。 I am used to C where everything is a char array..
我习惯了C,这里的所有内容都是char数组。
Strings in Swift are a different different kid of beast compared to C and are not just arrays of characters (there is a nice article at the Swift blog which I would suggest you to read, BTW). 与C相比,Swift中的字符串是不同的野兽,而不仅仅是字符数组(Swift博客上有一篇不错的文章 ,我建议您阅读,顺便说一句)。 In your case you can use
characters
property of the String
type, which is basically a view that gives you access to individual characters in the string. 在您的情况下,您可以使用
String
类型的characters
属性,该属性基本上是一个视图,可让您访问字符串中的各个字符。
For example, you could do: 例如,您可以这样做:
let strings = ["abc", "abc", "abc"]
let chars = strings.reduce(Set<Character>()) {
(var output: Set<Character>, string: String) -> Set<Character> in
string.characters.forEach() {
output.insert($0)
}
return output
}
let test = "fgh"
if test.characters.contains({ chars.contains($0) }) {
print("Do one thing")
} else {
print("Do another thing")
}
In the above code strings
array contains all your 3 compare-to strings. 在上面的代码
strings
数组中,包含所有3个“与”字符串。 Then there is a set chars
created out of them that contains all the individual characters from all of the strings. 然后从中创建一个
chars
集,其中包含所有字符串中的所有单个字符。 And finally there is a test
which contains user input. 最后是一个包含用户输入的
test
。
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