Int32Array

Int32Array is a built-in typed array in JavaScript that provides a view of 32-bit signed integers. It stores elements as 32-bit two’s-complement values and presents them in a fixed-length, contiguous memory layout. As a result, it is well suited to binary data processing and to interfacing with Web APIs that expect integer buffers. Each element can be read or written using numeric indices, and the allowed range per element is -2147483648 to 2147483647.

Int32Array is a view over an ArrayBuffer. It can be constructed with a length, with an existing ArrayBuffer, with another typed array, or with a buffer offset and a length: new Int32Array(length); new Int32Array(buffer); new Int32Array(buffer, byteOffset, length); new Int32Array(anotherTypedArray). The underlying buffer is shared by all views created from it, allowing efficient data sharing without copying.

Elements are stored in 4 bytes each, and the array has a fixed length. The type conversion rules apply when assigning values: non-number values are converted via ToNumber, and numbers outside the 32-bit signed range are wrapped to fit, following two’s-complement semantics. Typed arrays do not support methods like push or pop; instead, use set to populate from another array and subarray to create a new view of a portion of the buffer.

Common use cases include low-level numeric processing, binary protocols, WebGL buffers, and interoperation with WebAssembly memory. Int32Array works alongside other typed arrays and ArrayBuffer, forming part of the JavaScript specification for handling binary data efficiently. It is widely supported in modern engines.