My goal is to randomly select Anna 67% of the time, Bob 30% of the time, and Tom 3% of the time. Is there a more streamlined method for achieving this?
Here's what I've come up with:
var names = ['Anna', 'Bob', 'Tom'];
var name = names[Math.ceil(Math.random() * (names.length - 1))];
console.log(name);
After reading through Stack Overflow, I believe the code snippet below will effectively solve your problem:
function randomlySelect(input) {
let randomValue = input.reduce((a, b) => a + b) * Math.random();
return input.findIndex(a => (randomValue -= a) < 0);
}
function multipleRandomSelections(input, numberOfSelections) {
return Array.from(Array(numberOfSelections), randomlySelect.bind(null, input));
}
const names = ['Alice', 'Charlie', 'David'];
const chosenIndex = multipleRandomSelections([0.67, 0.3, 0.03], names);
console.log(names[chosenIndex]);
// Testing to verify that everything is functioning correctly:
const occurrences = [0, 0, 0];
for (let j = 0; j < 100000; j++) {
const result = multipleRandomSelections([0.67, 0.3, 0.03], names);
occurrences[result] = occurrences[result] + 1;
}
console.log(occurrences.map(o => o / 1000));Check out this quick fix for your problem:
function chooseName(){
var randomNumber = Math.random();
if(randomNumber < .67) return "Alice";
if(randomNumber < .97) return "Brian";
return "Sam";
}
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