Javascript Uint8Array find()

Introduction

The Javascript Uint8Array find() method searches a value in the typed array via the provided testing function.

If not found, undefined is returned. 

Uint8Array.find(callback[, thisArg])
Parameter
 Optional
 Meaning
callback




 Required




 Function to execute on each value
Taking three arguments:
element - the current element being processed.
index - the index of the current element.
array - the array itself.
thisArg
 Optional.
 Object to use as this when executing callback.

Find a prime number in a typed array 

function isPrime(element, index, array) {
   var start = 2;
   while (start <= Math.sqrt(element)) {
       if (element % start++ < 1) {
           return false;
       }// ww w .j  a  v  a  2s .  c  om
   }
   return element > 1;
}

var uint8 = new Uint8Array([4, 5, 8, 12]);
console.log(uint8.find(isPrime)); // 5



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