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This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including drand. Try it out:
const Drand = require('drand')
const _ = require('lodash')
const seed = 12346
/*
* =============================================================================
* You can create an instance of Drand to pass around.
*/
const r = new Drand(seed)
const demo = {
float: r.rand(), // [0, 1)
floatUpper: r.rand(33.33333), // [0, upper)
floatBound: r.rand(Math.E, Math.PI), // [lower, upper)
int: r.randInt(), // [-2^32, 2^32-1)
intUpper: r.randInt(128), // [0, upper)
intBound: r.randInt(256, 512),
long: r.randLong(), // [Number.MIN_SAFE_INTEGER, Number.MAX_SAFE_INTEGER)
longUpper: r.randLong(Math.pow(2, 42)), // [0, upper)
longBound: r.randLong(Math.pow(2, 35), Math.pow(2, 40)),
}
console.log(demo)
/*
* =============================================================================
* It maybe easier to just use the static functions attached to `Math`. These
* functions are attached by default when the library is loaded, but you can
* optionally seed the static instance. Note that you can seed the static
* instance as many times as needed.
*/
// Optional
Drand.setGlobal(seed)
const globalDemo = {
float: Math.drand(), // [0, 1)
floatUpper: Math.drand(33.33333), // [0, upper)
floatBound: Math.drand(Math.E, Math.PI), // [lower, upper)
int: Math.drandInt(), // [-2^32, 2^32-1)
intUpper: Math.drandInt(128), // [0, upper)
intBound: Math.drandInt(256, 512),
long: Math.drandLong(), // [NumbeMath.dMIN_SAFE_INTEGER, NumbeMath.dMAX_SAFE_INTEGER)
longUpper: Math.drandLong(Math.pow(2, 42)), // [0, upper)
longBound: Math.drandLong(Math.pow(2, 35), Math.pow(2, 40)),
}
console.log(globalDemo)
console.log(`_.isEqual(demo, globalDemo) = ${_.isEqual(demo, globalDemo)}`)
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