TypedArray.prototype.every()

The every() method of TypedArray instances returns false if it finds an element in the array that does not satisfy the provided testing function. Otherwise, it returns true. This method has the same algorithm as Array.prototype.every().

Try it

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

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

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

Syntax

every(callbackFn)
every(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 every() was called upon.

thisArg Optional

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

Return value

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

Description

See Array.prototype.every() 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 all elements in the typed array are 10 or bigger.

function isBigEnough(element, index, array) {
  return element >= 10;
}
new Uint8Array([12, 5, 8, 130, 44]).every(isBigEnough); // false
new Uint8Array([12, 54, 18, 130, 44]).every(isBigEnough); // true

Specifications

Browser compatibility

See also

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