EN
JavaScript - generate random long value as string (without BigInt usage)
8 points
In this short article, we would like to show how in simple way generate random long value as string using JavaScript.
Note: as long value we understand signed 64 bits integer value (from
-9223372036854775808to9223372036854775807).
Quick solution:
xxxxxxxxxx1
const randomNumber = (min, max) => {2
const scope = max - min + 1;3
return Math.floor(min + scope * Math.random());4
};5
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const randomString = (min, max, length = 0) => {7
let text = String(randomNumber(min, max));8
for (let i = text.length; i < length; ++i) {9
text = '0' + text;10
}11
return text;12
};13
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const randomLong = () => {15
//16
// - 922337203685477 5808 <--- min long value (int64)17
// + 922337203685477 5807 <--- max long value (int64)18
// AAAAAAAAAAAAAAA BBBB19
//20
// A - part 121
// B - part 222
//23
const a = randomNumber(-922337203685477, +922337203685477);24
if (a < 0) {25
return a + randomString(0, a > -922337203685477 ? 10000 : 5808, 4);26
} else {27
return a + randomString(0, a < +922337203685477 ? 10000 : 5807, 4);28
}29
};30
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// Usage example:33
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console.log(randomLong()); // -673375105369866990035
console.log(randomLong()); // -68237085351378383736
console.log(randomLong()); // 5592452255720332045Note: the above solution doesn't use
BigInttype that makes it working in the older JavaScript engines.
