Learn ECMAScript - Second Edition

Typed arrays

We saw how to read and write numbers in array buffers. But the method was very cumbersome because we had to call a function every time. Typed arrays let us read and write to an ArrayBuffer object just like we do for normal arrays.

A typed array acts as a wrapper for an ArrayBuffer object and treats data from an ArrayBuffer object as a sequence of n-bit numbers. The n value depends on how we created the typed array.

Next is a code example that demonstrates how to create an ArrayBuffer object and read/write to it using a typed array:

const buffer = new ArrayBuffer(80);const typed_array = new Float64Array(buffer);typed_array[4] = 11;console.log(typed_array.length);console.log(typed_array[4]);

The output is:

1011

Here we created ...