Float64Array

Summary

A typed array of 64-bit float values. The contents are initialized to 0. If the requested number of bytes could not be allocated an exception is raised.

Syntax

float64Array = new Float64Array( length );

float64Array = new Float64Array( array );

float64Array = new Float64Array( buffer , byteOffset , length );

float64Array

Required. The variable name to which the Float64Array object is assigned.

length

Specifies the length (in bytes) of the array.

array

The array (or typed array) that is contained in this array… The contents are initialized to the contents of the given array or typed array, with each element converted to the Float64 type.

buffer

The ArrayBuffer that the Float64Array represents.

byteOffset

Optional. Specifies the offset in bytes from the start of the buffer at which the Float64Array should begin.

length

The length of the array.

Examples

The following example shows how to use a Float64Array object to process the binary data acquired from an XmlHttpRequest:

var req = new XMLHttpRequest();
     req.open('GET', "http://www.example.com");
     req.responseType = "arraybuffer";
     req.send();

     req.onreadystatechange = function () {
         if (req.readyState === 4) {
             var buffer = req.response;
             var dataview = new DataView(buffer);
             var ints = new Float64Array(buffer.byteLength / 8);
             for (var i = 0; i < ints.length; i++) {
                 ints[i] = dataview.getFloat64(i * 8);
             }
         alert(ints[10]);
         }
     }

Constants

The following table lists the constants of the Float64Array object.

Properties

The following table lists the constants of the Float64Array object.

Methods

The following table lists the methods of the Float64Array object.

Attributions

• Microsoft Developer Network: Article