| 1 | var randHex = require('./randHex');
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| 2 | var choice = require('./choice');
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| 3 |
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| 4 | /**
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| 5 | * Returns pseudo-random guid (UUID v4)
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| 6 | * IMPORTANT: it's not totally "safe" since randHex/choice uses Math.random
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| 7 | * by default and sequences can be predicted in some cases. See the
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| 8 | * "random/random" documentation for more info about it and how to replace
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| 9 | * the default PRNG.
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| 10 | */
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| 11 | function guid() {
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| 12 | return (
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| 13 | randHex(8)+'-'+
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| 14 | randHex(4)+'-'+
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| 15 | // v4 UUID always contain "4" at this position to specify it was
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| 16 | // randomly generated
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| 17 | '4' + randHex(3) +'-'+
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| 18 | // v4 UUID always contain chars [a,b,8,9] at this position
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| 19 | choice(8, 9, 'a', 'b') + randHex(3)+'-'+
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| 20 | randHex(12)
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| 21 | );
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| 22 | }
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| 23 | module.exports = guid;
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| 24 |
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