pick randomly from a list with weighted probabilities

tinypicker.js

// by Piter Pasma
// also see https://twitter.com/piterpasma/status/1591727290802741248

// pick from a weighted list of parameters (81 chars)
pk=(...w)=>(t=0,w.map(x=>x[0]=(t+=x[0])),t=R(t),w.filter(x=>t<x[0])[0].slice(1));
// pick from a weighted list of parameters (76 chars)
pk=(...w)=>(t=0,w.map(x=>x[0]=(t+=x[0])),t=R(t),w.find(x=>t<x[0]).slice(1));

// usage
console.log(pk(
  [5,'aap'],
  [25,'noot'],
  [7,'mies'],
  [1,'boom'],
  [13,'roos'],
));

// outputs
// ['noot']

// sample usage for parameters
[$fxhashFeatures.bgcolor, bgcolor] = pk(
  [3,'brown','#886600']
  [12,'yellow','#ffff00']
  [37,'white','#ffffff']
  [6,'blue','#3366ff']
);

Great! thanks Piter