Arbitrage in binary options kings simple but effective 6013 comments
A buffer implemented by the ArrayBuffer object 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 context — that is, a data type, starting offset, and the number of elements — that turns the data into a typed array. The ArrayBuffer is a data type that is used to represent a generic, fixed-length binary data buffer. You can't directly manipulate the contents of an ArrayBuffer ; instead, you create a typed array view or a DataView which represents the buffer in a specific format, and use that to read and write the contents of the buffer.
Typed array views have self-descriptive names and provide views for all the usual numeric types like Int8 , Uint32 , Float64 and so forth. There is one special typed array view, the Uint8ClampedArray.
It clamps the values between 0 and This is useful for Canvas data processing , for example. This is useful when dealing with different types of data, for example. Typed array views are in the native byte-order see Endianness of your platform. With a DataView you are able to control the byte-order. At this point, we have a chunk of memory whose bytes are all pre-initialized to 0.
There's not a lot we can do with it, though. We can confirm that it is indeed 16 bytes long, and that's about it:.
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 bit signed integers:. This fills out the 4 entries in the array 4 entries at 4 bytes each makes 16 total bytes with the values 0, 2, 4, and 6. Things start to get really interesting when you consider that you can create multiple views onto the same data. For example, given the code above, we can continue like this:. Here we create a bit integer view that shares the same buffer as the existing bit view and we output all the values in the buffer as bit integers.
Now we get the output 0, 0, 2, 0, 4, 0, 6, 0. The output from this is "Entry 0 in the bit array is now 32". In other words, the two arrays are indeed simply viewed on the same data buffer, treating it as different formats. You can do this with any view types. By combining a single buffer with multiple views of different types, starting at different offsets into the buffer, you can interact with data objects containing multiple data types.
This lets you, for example, interact with complex data structures from WebGL , data files, or C structures you need to use while using js-ctypes. After processing a typed array, it is sometimes useful to convert it back to a normal array in order to benefit from the Array prototype. This can be done using Array. Get the latest and greatest from MDN delivered straight to your inbox. Please check your inbox or your spam filter for an email from us.
The data structure alignment in a C structure is platform-dependent. Take precautions and considerations for these padding differences. The compatibility table on this page is generated from structured data.
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