blocks|key|4616977|text|var+language+=+"Swift"+
var+resultStr+=+"\(language)+is+a+new+programming+language"|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4616978|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>var language = "Swift" 
var resultStr = "\(language) is a new programming language"
</code></pre>

blocks|key|4616986|text|这也是可行的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4616987|var+string+=+"swift"
var+resultStr+=+string+%2B+"+is+a+new+Programming+Language"|code-block|syntax|javascript|4616988|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This will work too:

<pre><code>var string = "swift"
var resultStr = string + " is a new Programming Language"
</code></pre>

blocks|key|4617009|text|\这用于将一个字符串附加到另一个字符串。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4617010|var+first+=+"Hi"+
var+combineStr+=+"\(first)+Start+develop+app+for+swift"|code-block|syntax|javascript|4617011|你也可以试试这个：-%2B关键字。|4617012|+var+first+=+"Hi"+
+var+combineStr+=+"%2B(first)+Start+develop+app+for+swift"|4617013|试试这段代码。|4617014|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

\ this is being used to append one string to another string.

<pre><code>var first = "Hi" 
var combineStr = "\(first) Start develop app for swift"
</code></pre>

You can try this also:- + keyword.

<pre><code> var first = "Hi" 
 var combineStr = "+(first) Start develop app for swift"
</code></pre>

Try this code.

blocks|key|4616992|text|let+the_string+=+"Swift"
let+resultString+=+"\(the_string)+is+a+new+Programming+Language"|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4616993|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>let the_string = "Swift"
let resultString = "\(the_string) is a new Programming Language"
</code></pre>

blocks|key|4617069|text|Xcode不接受用普通字符串添加的可选字符串。我写这个扩展就是为了解决这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4617070|extension+String+{
++++mutating+func+addString(str:+String)+{
++++++++self+=+self+%2B+str
++++}
}|code-block|syntax|javascript|4617071|然后你可以这样叫它：|4617072|var+str1:+String?
var+str1+=+"hi"
var+str2+=+"+my+name+is"
str1.addString(str2)
println(str1)+//hi+my+name+is|4617073|但是，您现在也可以这样做：|4617074|var+str1:+String?
var+str1+=+"hi"
var+str2+=+"+my+name+is"
str1!+%2B=+str2|4617075|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Xcode didn't accept optional strings added with a normal string. I wrote this extensions to solve that problem:

<pre><code>extension String {
 mutating func addString(str: String) {
 self = self + str
 }
}
</code></pre>

Then you can call it like:

<pre><code>var str1: String?
var str1 = "hi"
var str2 = " my name is"
str1.addString(str2)
println(str1) //hi my name is
</code></pre>

However you could now also do something like this:

<pre><code>var str1: String?
var str1 = "hi"
var str2 = " my name is"
str1! += str2
</code></pre>

blocks|key|111022|text|它被称为字符串插值。它是使用常量、变量、文字和表达式创建新字符串的方法。例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|111023|++++++let+price+=+3
++++++let+staringValue+=+"The+price+of+\(price)+mangoes+is+equal+to+\(price*price)+"|code-block|syntax|javascript|111024|也是|111025|let+string1+=+"anil"
let+string2+=+"gupta"
let+fullName+=+string1+%2B+string2++//+fullName+is+equal+to+"anilgupta"
or+
let+fullName+=+"\(string1)\(string2)"+//+fullName+is+equal+to+"anilgupta"|111026|它也意味着连接字符串值。|111027|希望这对你有帮助。|111028|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

It is called as String Interpolation.
It is way of creating NEW string with CONSTANTS, VARIABLE, LITERALS and EXPRESSIONS.
 for examples:

<pre><code> let price = 3
 let staringValue = "The price of \(price) mangoes is equal to \(price*price) "
</code></pre>

also 

<pre><code>let string1 = "anil"
let string2 = "gupta"
let fullName = string1 + string2 // fullName is equal to "anilgupta"
or 
let fullName = "\(string1)\(string2)" // fullName is equal to "anilgupta"
</code></pre>

it also mean as concatenating string values.

Hope this helps you.

blocks|key|110796|text|要打印组合字符串，请使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|110797|Println("\(string1)\(string2)")|code-block|syntax|javascript|110798|或者String3存储2个字符串组合的输出|110799|let+strin3+=+"\(string1)\(string2)"|110800|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

To print the combined string using 

<pre><code>Println("\(string1)\(string2)")
</code></pre>

or String3 stores the output of combination of 2 strings

<pre><code>let strin3 = "\(string1)\(string2)"
</code></pre>

blocks|key|4617136|text|用户还可以在Swift中使用stringByAppendingFormat。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4617137|var+finalString+:+NSString+=+NSString(string:+"Hello")
finalString+=+finalString.stringByAppendingFormat("%25@",+"+World")
print(finalString)+//Output:-+Hello+World
finalString+=+finalString.stringByAppendingFormat("%25@",+"+Of+People")
print(finalString)+//Output:-+Hello+World+Of+People|code-block|syntax|javascript|4617138|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

One can also use stringByAppendingFormat in Swift.

<pre><code>var finalString : NSString = NSString(string: "Hello")
finalString = finalString.stringByAppendingFormat("%@", " World")
print(finalString) //Output:- Hello World
finalString = finalString.stringByAppendingFormat("%@", " Of People")
print(finalString) //Output:- Hello World Of People
</code></pre>

blocks|key|111033|text|我刚从Objective-C切换到Swift+(4)，我发现我经常使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|111034|let+allWords+=+String(format:"%25@+%25@+%25@",message.body!,+message.subject!,+message.senderName!)|code-block|syntax|javascript|111035|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I just switched from Objective-C to Swift (4), and I find that I often use:

<pre><code>let allWords = String(format:"%@ %@ %@",message.body!, message.subject!, message.senderName!)
</code></pre>

blocks|key|110942|text|您可以使用SwiftString+(https://github.com/amayne/SwiftString)来完成此操作。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|110943|"".join(["string1",+"string2",+"string3"])+//+"string1string2string"
"+".join(["hello",+"world"])+//+"hello+world"|code-block|syntax|javascript|110944|免责声明:我写了这个扩展|110945|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/amayne/SwiftString^0|I|11|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

You could use SwiftString (<a href="https://github.com/amayne/SwiftString" rel="nofollow">https://github.com/amayne/SwiftString</a>) to do this.

<pre><code>"".join(["string1", "string2", "string3"]) // "string1string2string"
" ".join(["hello", "world"]) // "hello world"
</code></pre>

DISCLAIMER: I wrote this extension

blocks|key|4617274|text|Swift+5：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4617275|将字符串数组转换为单个字符串|4617276|let+array+=+["Ramana","Meharshi","Awareness","Oneness","Enlightnment","Nothing"]
let+joined+=+array.joined(separator:+",")|code-block|syntax|javascript|4617277|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<h2>Swift 5:</h2>
<h2>Array of strings into a Single string</h2>
<pre><code>let array = [&quot;Ramana&quot;,&quot;Meharshi&quot;,&quot;Awareness&quot;,&quot;Oneness&quot;,&quot;Enlightnment&quot;,&quot;Nothing&quot;]
let joined = array.joined(separator: &quot;,&quot;)
</code></pre>

blocks|key|4617229|text|在Swift+5中，苹果引入了使用#+symbols的原始字符串。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4617230|示例：|4617231|print(#"My+name+is+"XXX"+and+I'm+"28"."#)
let+name+=+"XXX"
print(#"My+name+is+\#(name)."#)|code-block|syntax|javascript|4617232|符号#在后面是必需的。规则(name)将被解释为字符串中的字符。|4617233|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In Swift 5 apple has introduces Raw Strings using # symbols.

Example:

<pre><code>print(#"My name is "XXX" and I'm "28"."#)
let name = "XXX"
print(#"My name is \#(name)."#)
</code></pre>

symbol # is necessary after \. A regular \(name) will be interpreted as characters in the string.

How to concatenate string in Swift?

In <code>Objective-C</code> we do like

<pre><code>NSString *string = @"Swift";
NSString *resultStr = [string stringByAppendingString:@" is a new Programming Language"];
</code></pre>

or

<pre><code>NSString *resultStr=[NSString stringWithFormat:@"%@ is a new Programming Language",string];
</code></pre>

But I want to do this in Swift-language.

How do I concatenate strings in Swift?

如何在Swift中连接字符串？在Objective-C中，我们确实喜欢NSString *string = @"Swift";NSString *resultStr = [string stringByAppendingString:@" is a new Programming Language"];或NSString *resultStr=[NSString stringWithFormat:

问如何在Swift中连接字符串？
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