Question

How to get multiple random elements from an array in Node.js

Answer 1

function getMultipleRandomElements(arr, num_elements) {
    // 0.5 - Math.random()) = -0.5...0.5
    // sort order will be set to increase or decrease
  	const shuffled = [...arr].sort(() => 0.5 - Math.random());

  	return shuffled.slice(0, num_elements);
}

const arr = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k'];

console.log(getMultipleRandomElements(arr, 2)); 
console.log(getMultipleRandomElements(arr, 3)); 
console.log(getMultipleRandomElements(arr, 4)); 

  
  
  
  
/*
run:

[ 'h', 'g' ]
[ 'd', 'e', 'f' ]
[ 'f', 'g', 'j', 'e' ]

*/

 

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