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Best way to get two nibbles out of a byte in javascript?

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问题 I'm parsing a binary file in javascript that is storing two pieces of information per byte, one per nibble. The values are, of course, 0-16 and 0-16. In all other parts of the file format, each byte represents one piece of information, so I have been using the following to successfully get the number values I need: var num = str.charCodeAt(0) & 0xFF; But I'm stuck at trying to figure out how to get the 0-16 value of the first nibble, and the same for the 2nd nibble from my single byte

Best way to get two nibbles out of a byte in javascript?

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Reading top nibble and bottom nibble in a byte

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问题 What's the correct way to handle two distinct values being stored in one byte of data. I have a byte that contains two nibbles each containing their own data. I want to read the top nibble and the bottom nibble into their own variables. 11110000 = High 4 bits throttle, to be read into $throttle , and should be a value from 0 to 15. 00001111 = Low 4 bits brake, to be read into $brake , and should be a value from 0 to 15. Don't forget , drivers can apply the throttle and the brake at the same

Is there a .NET data-type smaller than a byte?

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问题 How about a Nibble etc. 回答1: No. Even if you have an array of Booleans, I believe they're specified to take up one byte each. Of course you can define your own data types which have fewer than 256 valid values (like Boolean does) but you can't make it take up less than a byte in memory. As LBushkin pointed out, there are types such as BitArray and BitVector32 which effectively pack multiple bits efficiently - you could write your own NybbleArray type if you wanted. 回答2: There's no native data

Is there a .NET data-type smaller than a byte?

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How about a Nibble etc. No. Even if you have an array of Booleans, I believe they're specified to take up one byte each. Of course you can define your own data types which have fewer than 256 valid values (like Boolean does) but you can't make it take up less than a byte in memory. As LBushkin pointed out, there are types such as BitArray and BitVector32 which effectively pack multiple bits efficiently - you could write your own NybbleArray type if you wanted. There's no native data-type smaller than byte, however if you want to store and manipulate a group of packed bits, you can use