JavaScript Boolean and dataView Complete Reference

JavaScript Boolean: Boolean is a datatype that returns either true or false In JavaScript, a boolean is used as a function to get the value of a variable, object, conditions, expressions, etc in terms of true or false

Syntax:

Boolean(variable/expression) 

Example: If the operands are equal, the equal to operator == returns true

Javascript

<script>
    console.log(15 == 15)
    console.log(15 == 11)
</script>

Output:

true
false

Constructor:

JavaScript Boolean Constructor	Description
Prototype	Add a new property and methods to all Boolean instances

JavaScript Boolean Methods 

Methods	Description
toString()	Return a string either “true” or “false” depending upon the value of the specified boolean object
valueOf()	Return a boolean value either “true” or “false” depending upon the value of the specified boolean object

JavaScript Boolean Properties:

Property	Description
constructor	Returns the constructor function for an object

Methods:

JavaScript dataView: The DataView function in JavaScript provides an interface to read and write more than one number type into an ArrayBuffer

Syntax:

new DataView(buffer, byteOffset, byteLength)

Example: JavaScript code to show the working of dataView() function:

Javascript

<script>
   // Creating an ArrayBuffer with a size in bytes
   var buffer = new ArrayBuffer(16);

   // Creating views
   var view1 = new DataView(buffer);

   // Creating view from byte 0 for the next 4 bytes
   var view2 = new DataView(buffer,0,4);

   // Creating view from byte 12 for the next 2 bytes
   var view3 = new DataView(buffer,12,2);

   // Putting 1 in slot 0
   view1.setInt8(0, 1);

   // Putting 2 in slot 12
   view1.setInt8(12, 2)

   // Printing the views
   console.log(view2.getInt8(0))
   console.log(view3.getInt8(0))
</script>

Output:

1
2

JavaScript dataview Methods:

Methods	Description
getFloat32()	Get a 32-bit float at the specified location
getFloat64()	Get a 64-bit float at the specified location
getInt8()	Get an 8-bit integer in the byte at the specified location
getInt16()	Get a 16-bit integer at the specified location
getInt32()	Get a 32-bit integer at the specified location
getUint8()	Get an unsigned 8-bit integer at the specified location
getUint16()	Get an unsigned 16-bit integer at the specified location
getUint32()	Get an unsigned 32-bit integer at the specified location
setFloat32()	Get an assigned 32-bit float value at the specified location
setFloat64()	Get an assigned 64-bit float value at the specified location;
setInt8()	Get an signed 8-bit integer at the specified location
setInt16()	Get an assigned 16-bit integers at the specified location
setInt32()	Get an assigned 32-bit integers at the specified location
setUint8()	Get an unsigned 8-bit integer at the specified location
setUint16()	Get an unsigned 16-bit integer at the specified location
setUint32()	Get an unsigned 32-bit integer at the specified location