Symbols used in Syntax of Scala Language

Scala Lang has many different symbols used in its syntax. Below is the list of symbols and its 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 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 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 seperate 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 contrain the allowed types.
```
def apply[T <: U](x:T)
```
"<%" symbolis called as view bound (apply implicit conversion) and is used in paramaterized and abstract type declaration to convert the type using view.
```
def m[A<%B](args):R
```
">:" symbolis 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)]
```
"#" symbolis used to refer to a type declaration nested in another type
```
val ic: MyClass#myType
```
"@" sybmolmarks an annotation
```
@deprecated def sum() = ...
```