The find() method of TypedArray instances returns the first element in the provided typed array that satisfies the provided testing function. If no values satisfy the testing function, undefined is returned. This method has the same algorithm as Array.prototype.find.

Syntax

find(callbackFn)
find(callbackFn, thisArg)

Parameters

• callbackFn
  • : A function to execute for each element in the typed array. It should return a truthy value to indicate a matching element has been found, and a falsy value otherwise. The function is called with the following arguments:
    • element
      • : The current element being processed in the typed array.
    • index
      • : The index of the current element being processed in the typed array.
    • array
      • : The typed array find() was called upon.

• thisArg

  • : A value to use as this when executing callbackFn. See iterative methods.

Return value

The first element in the typed array that satisfies the provided testing function. Otherwise, undefined is returned.

Description

See Array.prototype.find for more details. This method is not generic and can only be called on typed array instances.

Examples

Find a prime number in a typed array

The following example finds an element in the typed array that is a prime number (or returns undefined if there is no prime number).

function isPrime(element, index, array) {
  let start = 2;
  while (start <= Math.sqrt(element)) {
    if (element % start++ < 1) {
      return false;
    }
  }
  return element > 1;
}

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

Specifications

Browser compatibility

See also

• Polyfill of TypedArray.prototype.find in core-js
• JavaScript typed arrays guide
• TypedArray
• TypedArray.prototype.findIndex
• TypedArray.prototype.findLast
• TypedArray.prototype.findLastIndex
• TypedArray.prototype.includes
• TypedArray.prototype.filter
• TypedArray.prototype.every
• TypedArray.prototype.some
• Array.prototype.find