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node-int64

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node-int64

Support for representing 64-bit integers in JavaScript

    0.4.0latest

Version published
Maintainers
1
Weekly downloads
17,350,784
increased by1.84%

Weekly downloads

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JavaScript Numbers are represented as IEEE 754 double-precision floats. Unfortunately, this means they lose integer precision for values beyond +/- 2^^53. For projects that need to accurately handle 64-bit ints, such as node-thrift, a performant, Number-like class is needed. Int64 is that class.

Int64 instances look and feel much like JS-native Numbers. By way of example ...

// First, let's illustrate the problem ... > (0x123456789).toString(16) '123456789' // <- what we expect. > (0x123456789abcdef0).toString(16) '123456789abcdf00' // <- Ugh! JS doesn't do big ints. :( // So let's create a couple Int64s using the above values ... // Require, of course > Int64 = require('node-int64') // x's value is what we expect (the decimal value of 0x123456789) > x = new Int64(0x123456789) [Int64 value:4886718345 octets:00 00 00 01 23 45 67 89] // y's value is Infinity because it's outside the range of integer // precision. But that's okay - it's still useful because it's internal // representation (octets) is what we passed in > y = new Int64('123456789abcdef0') [Int64 value:Infinity octets:12 34 56 78 9a bc de f0] // Let's do some math. Int64's behave like Numbers. (Sorry, Int64 isn't // for doing 64-bit integer arithmetic (yet) - it's just for carrying // around int64 values > x + 1 4886718346 > y + 1 Infinity // Int64 string operations ... > 'value: ' + x 'value: 4886718345' > 'value: ' + y 'value: Infinity' > x.toString(2) '100100011010001010110011110001001' > y.toString(2) 'Infinity' // Use JS's isFinite() method to see if the Int64 value is in the // integer-precise range of JS values > isFinite(x) true > isFinite(y) false // Get an octet string representation. (Yay, y is what we put in!) > x.toOctetString() '0000000123456789' > y.toOctetString() '123456789abcdef0' // Finally, some other ways to create Int64s ... // Pass hi/lo words > new Int64(0x12345678, 0x9abcdef0) [Int64 value:Infinity octets:12 34 56 78 9a bc de f0] // Pass a Buffer > new Int64(new Buffer([0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0])) [Int64 value:Infinity octets:12 34 56 78 9a bc de f0] // Pass a Buffer and offset > new Int64(new Buffer([0,0,0,0,0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0]), 4) [Int64 value:Infinity octets:12 34 56 78 9a bc de f0] // Pull out into a buffer > new Int64(new Buffer([0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0])).toBuffer() <Buffer 12 34 56 78 9a bc de f0> // Or copy into an existing one (at an offset) > var buf = new Buffer(1024); > new Int64(new Buffer([0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0])).copy(buf, 512);

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FAQs

What is node-int64?

Support for representing 64-bit integers in JavaScript

Is node-int64 popular?

The npm package node-int64 receives a total of 15,101,552 weekly downloads. As such, node-int64 popularity was classified as popular.

Is node-int64 well maintained?

We found that node-int64 demonstrated a not healthy version release cadence and project activity because the last version was released a year ago.It has 1 open source maintainer collaborating on the project.

Last updated on 04 Apr 2015

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