> For the complete documentation index, see [llms.txt](https://sron.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sron.gitbook.io/docs/functions-in-sron/type-checking-functions.md).

# Type Checking functions

#### For faster and efficient checking of the types of values, SRON provides 7 functions

> * isVoid()
> * isInt()
> * isDouble()
> * isChar()
> * isBool()
> * isCollective()
> * isString()
> * isList()
> * isFileReader()
> * isFileWriter()
> * isLiteralString()

***

### **1. isVoid():**

This function returns true if the passed value is Void otherwise false.

```js
{
    name : Main
    Any val = Void

    if : {
        condition : isVoid(val)
        println("Value is Void")
    }
    else : { 
        println("Value is not Void")
    }
}
```

#### **OUTPUT:**

> Value is Void

***

### **2. isInt():**

This function returns true if the passed value is of type **'Int'** otherwise false.

```js
{
    name : Main
    Any val = 27062003

    if : {
        condition : isInt(val)
        println("Value is an Integer")
    }
    else : { 
        println("Value is not an Integer")
    }
}
```

#### **OUTPUT:**

> Value is an integer

***

### **3. isDouble():**

This function returns true if the passed value is of type **'Double'** otherwise false.

```js
{
    name : Main
    Any val = 2706.2003

    if : {
        condition : isDouble(val)
        println("Value is a decimal number")
    }
    else : { 
        println("Value is not a decimal number")
    }
}
```

#### **OUTPUT:**

> Value is a decimal number

***

### **4. isChar():**

This function returns true if the passed value is of type **'Char'** otherwise false.

```js
{
    name : Main
    Any val = 'S'

    if : {
        condition : isChar(val)
        println("Value is a character")
    }
    else : { 
        println("Value is not a character")
    }
}

```

#### **OUTPUT:**

> Value is a character

***

### **5. isBool():**

This function returns true if the passed value is of type **'Bool'** Void otherwise false.

```js
{
    name : Main
    Any val = false

    if : {
        condition : isBool(val)
        println("Value is a boolean")
    }
    else : { 
        println("Value is not a boolean")
    }
}

```

#### **OUTPUT:**

> Value is a boolean

***

### **6. isCollective():**

This function returns true if the passed value is of type **'List'** or **'String'** otherwise false.

```js
{
    name : Main
    Any val = [1, 2, true, [91, 92]]

    if : {
        condition : isCollective(val)
        println("Value is of collective type")
    }
    else : { 
        println("Value is not of collective type")
    }
}
```

#### **OUTPUT:**

> Value is of collective type

***

### **7. isString():**

This function returns true if the passed value is of type **'String'** otherwise false.

```js
{
    name : Main
    String val = "SRON"

    if : {
        condition : isString(val)
        println("Value is a string")
    }
    else : { 
        println("Value is not a string")
    }
}

```

#### **OUTPUT:**

> Value is a string

***

### **8. isList():**

This function returns true if the passed value is of type **'List'** otherwise false.

```js
{
    name : Main
    Any val = [1,2,3,4.177]

    if : {
        condition : isList(val)
        println("Value is a list")
    }
    else : { 
        println("Value is not a list")
    }
}

```

#### **OUTPUT:**

> Value is a list

***

### **9. isFileReader():**

This function returns true if the passed value is of type **'FileReader'** otherwise false.

```js
{
    name : Main
    Any val = freader("file.txt")

    if : {
        condition : isFileReader(val)
        println("Value is a file reader")
    }
    else : { 
        println("Value is not a file reader")
    }
}

```

#### **OUTPUT:**

> Value is a file reader

***

### **10. isFileWriter():**

This function returns true if the passed value is of type **'FileWriter'** otherwise false.

```js
{
    name : Main
    Any val = fwriter("file.txt", true)

    if : {
        condition : isFileWriter(val)
        println("Value is a file writer")
    }
    else : { 
        println("Value is not a file writer")
    }
}

```

#### **OUTPUT:**

> Value is a file writer

***

### **11. isLiteralString():**

This function returns true if the passed value is of type **'LiteralString'** otherwise false.

```js
{
    name : Main
    Any val = "Hi! SRON"

    if : {
        condition : isLiteralString(val)
        println("Value is a LiteralString")
    }
    else : { 
        println("Value is not a LiteralString")
    }
}

```

#### **OUTPUT:**

> Value is a LiteralString

***