类型化数组(Typed Array)也是HTML5中新引入的API。用一句话解释类型化数组就是:它是JS操作二进制数据的接口。 众所周知,直接操作二进制数据可以使程序更为高效, 尽管JS对常规数组做了很多优化(JS数组被实现为对象形式),但是不得不承认JS数组的效率一直不高。比如在WebGL中的图像数据传输, 如果使用原生的JS数组, ...
如上所述,typed array的实现是组合了ArrayBuffer和DataView。也就是说typed array 通过ArrayBuffer创建内存块,通过DataView实现对内存块的读写操作。 typed array提供了多个类实现对同一块内存中的二进制数据按照不同的位数格式进行读写。如使用int8Array从内存中以带符号的8位整数的形式读写数据。 下面看一个例子来...
从现在开始,不使用new来调用一个Uint8ClampedArray构造函数将会抛出一个TypeError。 js vardv=Uint8ClampedArray([1,2,3]);// TypeError: calling a builtin Uint8ClampedArray constructor// without new is forbidden js vardv=newUint8ClampedArray([1,2,3]);...
Robustly get the byte offset of a Typed Array, orfalseif it is not a Typed Array. Works cross-realm, in every engine, even if thebyteOffsetproperty is overridden. Example vartypedArrayByteOffset =require('typed-array-byte-offset');varassert =require('assert'); assert.equal(false, typedArray...
Creates a new typed array from an array-likeobjector an iterable. vararr=Uint8Array.from([1,2]);// returns <Uint8Array>[ 1, 2 ] To invoke a function for eachsrcvalue, provide a callback function. functionmapFcn(v){returnv*2;}vararr=Uint8Array.from([1,2],mapFcn);// returns <...
To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.Usage var typedarray = require( '@stdlib/array-typed' ); typedarray( [dtype] ) Creates a typed array having a specified...
Strings should be ASCII-only and have a // "node:" prefix to avoid name clashes with third-party code. #define PER_ISOLATE_PRIVATE_SYMBOL_PROPERTIES(V) \ V(alpn_buffer_private_symbol, "node:alpnBuffer") \ V(arrow_message_private_symbol, "node:arrowMessage") \ V(contextify_context_...
The array must be initialized using a new expression. In addition, all elements in an array initializer must have a best common type. The following examples show how to declare an implicitly typed array: C# Copy var implicitType = new[] { 1, 2, 3 }; char c = 'c'; short s1 = ...
The array must be initialized using a new expression. In addition, all elements in an array initializer must have a best common type. The following examples show how to declare an implicitly typed array: C# Copy var implicitType = new[] { 1, 2, 3 }; char c = 'c'; short s1 = ...
$_set(index: number, val: number)should be interpreted as "Set value by index" Example: leta =newUint8Array(newArrayBuffer(4)) a[0] =1a[1] =2 $_iterator(): IterableIterator<number>can be tested viavalues()call constructor(elements: Iterable<number>)can be constructed withIterable ...