Try it

function isNegative(element, index, array) {
  return element < 0;
}

const int8 = new Int8Array([-10, 20, -30, 40, -50]);
const positives = new Int8Array([10, 20, 30, 40, 50]);

console.log(int8.some(isNegative));
// Expected output: true

console.log(positives.some(isNegative));
// Expected output: false

Syntax

some(callbackFn)
some(callbackFn, thisArg)

Parameters

callbackFn

A function to execute for each element in the typed array. It should return a truthy value to indicate the element passes the test, 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 some() was called upon.

thisArg Optional

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

Return value

false unless callbackFn returns a truthy value for a typed array element, in which case true is immediately returned.

Description

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

Examples

Testing size of all typed array elements

The following example tests whether any element in the typed array is bigger than 10.

function isBiggerThan10(element, index, array) {
  return element > 10;
}
new Uint8Array([2, 5, 8, 1, 4]).some(isBiggerThan10); // false
new Uint8Array([12, 5, 8, 1, 4]).some(isBiggerThan10); // true

Specifications

Browser compatibility

See also

• Polyfill of TypedArray.prototype.some in core-js
• JavaScript typed arrays guide
• TypedArray
• TypedArray.prototype.every()
• TypedArray.prototype.forEach()
• TypedArray.prototype.find()
• TypedArray.prototype.includes()
• Array.prototype.some()