Kata

Write a function that, given a list of weighted values, will return a random value using the weights to determine the probability of each value being returned.

Example:

const values  = ['a','b','c','d','e'];
const weights = [ 1,  2,  3,  4,  5 ];

const randomValue = weightedRandom(values, weights);

In this example the probability of each value being selected would be as follows:

• a : 0.066 ( 1/15 )
• b : 0.133 ( 2/15 )
• c : 0.2 ( 3/15 )
• d : 0.266 ( 4/15 )
• e : 0.333 ( 5/15 )