Question

How to select N reservoir items randomly from an array in TypeScript

Answer 1

function selectReservoir(array: number[], N: number) {
    return array.sort(() => 0.5 - Math.random()).slice(0, N);
}
  
var array: number[] = [4, 9, 14, 96, 13, 0, 3, 99, 19, 2, 80, 1, 7];
const N: number = 5;
  
const reservoir: number[] = selectReservoir(array, N);
  
console.log(reservoir);
  
  
  
/*
run:
  
[14, 4, 9, 2, 13] 
  
*/

 

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