Symbols used in Scala Syntax. Usage of Symbols in Scala Syntax

Scala Lang has many different symbols used in its syntax. Below is the list of symbols and their use in Scala language.

“->” arrow symbol in Scala syntax returns a two-element tuple containing the key and value. You can use this symbol as shown in the below example-
```
 Map(1->"Allan", 2->"Bob") (1).->("A) 
```
“_” underscore symbol in scala syntax is intended as a place holder, used in imports, functions literals.
```
 import com.kodehelp.scala._ case_=> value.toString 
```
“:” colon symbol in scala syntax act as a separator between identifiers and type annotations.
```
 def add(i:int):Int= ... 
```
“=” equal symbol in scala act as assignment operator
```
 val ten = 10 
```
“=>” symbol is used in function literals to separate the argument list from the function body
```
numbers.filter(x => x)
```
“<-” symbol is used for comprehensions in generator expressions
```
for(obj <- objects)
```
“<:” symbol is called as Upper bound (a subtype of) and is used in parameterized and abstract type declaration to constrain the allowed types.
```
def apply[T <: U](x:T)
```
“<%” symbol is called as view bound (apply implicit conversion) and is used in parameterized and abstract type declaration to convert the type using the view.
```
def m[A<%B](args):R
```
“>:” symbol is called lower bound (super type of) and is used in parameterized and abstract type declarations to constrain the allowed types.
```
def append[U >:T(x:U)]
```
“#” symbol is used to refer to a type declaration nested in another type
```
val ic: MyClass#myType
```
“@” sybmol marks an annotation
```
@deprecated def sum() = ...
```

I hope these symbols used in Scala syntax helps you get started with Scala Programming language.