Float64Array

Float64Array is a typed array in JavaScript that provides a view into an ArrayBuffer for 64-bit floating-point numbers using IEEE 754 double precision. It stores numbers as 64-bit doubles, and each element occupies 8 bytes.

It is one of several typed array views. It can be created with new Float64Array(length), new Float64Array(buffer, byteOffset, length), or by converting existing data using Float64Array.from(iterable) or Float64Array.of(...values).

As a view, it shares the underlying ArrayBuffer with other views; modifications via one view affect others sharing the same buffer. You can access elements by index, length indicates the number of elements, and you can copy data with set or create a subarray with subarray.

Typical usage includes numeric computations, binary data handling, and Web APIs such as WebGL buffers that require typed arrays. They offer performance advantages over regular JavaScript arrays for numerical data because they store dense binary data and provide efficient memory layout.

Limitations and notes: elements are converted to numbers; values outside the representable range follow JavaScript ToNumber rules and may become Infinity, -Infinity, or NaN. It cannot store non-numeric objects; length is fixed and the view is not resizable. To resize, you must create a new array or copy data to a new buffer.

Compatibility: Float64Array is supported in all modern browsers and Node.js. It is part of the TypedArray family introduced in ECMAScript 2015, alongside other views such as Float32Array, Int8Array, and Uint8Array.