JavaScript - convert long number to string
"" + 237498237498273908472390847239084710298374901823749081237409273492374098273904872398471298374
> '2.3749823749827392e+92'
I am calculating IDs in a nice and secret way:
time = new Date().getTime()
pid = process.pid
host = 0; (host +=s.charCodeAt(0) for s in os.hostname())
counter = MIPS.unique_id()
"#{host}#{pid}#{time}#{counter}"
Unfortunately, somewhere along the way are identifiers (for example 11207648813339434616800
). Unfortunately, this means that they sometimes refer to 1.1207648813339434e+22
.
UPDATE
It seems to be a "bug / feature" of redis. never expected it.
# Bug with Big Numbers on zadd
redis = require 'redis'
r = redis.createClient()
r.zadd 'zset', '342490809809999998098', 'key', ->
r.zscore 'zset', 'key', (_, results) ->
console.log typeof results # string
console.log results # 3.4249080981000002e+20
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Your number is converted to 2.3749823749827392e+92
before you concatenate the number with a string to convert it.
The only solution is to use a container format that accepts an arbitrary number of digits, which is either a string or an array.
Can you provide us with some details on how you get this number?
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Javascript uses an 8-byte double to store large numbers, which is 53-bit precision. In your case, it is far from 53 bits, so you should use a large number library that can store large numbers accurately. Try javascript-bignum
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