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Javascript typed arrays
JavaScript typed arrays are array-like objects and provide a mechanism for accessing raw binary data.
Array objects grow and shrink dynamically and can have any JavaScript value. JavaScript engines perform optimizations so that these arrays are fast.
Note − typed arrays are not to be confused with normal arrays, as calling Array.isArray() on a typed array returns false. Moreover, not all methods available for normal arrays are supported by typed arrays
JavaScript typed arrays are implemented using buffers and views.
A buffer is an object representing a chunk of data; it has no format to speak of and offers no mechanism for accessing its contents.
In order to access the memory contained in a buffer, you need to use a view. A view provides a data type, starting offset, and the number of elements — that turns the data into a typed array.
Example
// create a buffer with a fixed length of 16-bytes let buffer = new ArrayBuffer(16); // Before we can really work with this buffer, we need to create a view. // Let's create a view that treats the data in the buffer as an array of 32-bit signed integers: let int32View = new Int32Array(buffer); // we can access the fields in the array just like a normal array for (let i = 0; i < int32View.length; i++) { int32View[i] = i * 2; } console.log(int32View);
Output
Int32Array { [Iterator] 0: 0, 1: 2, 2: 4, 3: 6 }
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