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JavaScript-Array some()

Beispiel 1

Überprüfen Sie, ob Werte über 18 liegen:

const ages = [3, 10, 18, 20];

ages.some(checkAdult);
function checkAdult(age) {
  return age > 18;
}

Definition und Verwendung

Die some()Methode prüft, ob irgendwelche Array-Elemente einen Test bestehen (als Funktion bereitgestellt).

Die some()Methode führt die Funktion einmal für jedes Array-Element aus:

  • Wenn die Funktion true zurückgibt , some()gibt sie true zurück und stoppt.
  • Wenn die Funktion false zurückgibt , some()gibt sie false zurück und stoppt.

Die some()Methode führt die Funktion nicht für leere Array-Elemente aus.

Die some()Methode ändert das ursprüngliche Array nicht.


Syntax

array.some(function(value, index, arr), this)

Parameter

Parameter Description
function Required.
A function to run for each array element.
Function parameters:
value Required.
The value of the current element.
index Optional.
The index of the current element.
arr Optional.
The array the current element belongs to.
this Optional. Default undefined.
A value passed to the function to be used as its "this" value.

Rückgabewert

Typ Beschreibung
Ein boolescher Wert truewenn eines der Array-Elemente den Test besteht, andernfalls false.


Browser-Unterstützung

some()ist eine ECMAScript3 (ES3)-Funktion.

ES3 (JavaScript 1999) wird in allen Browsern vollständig unterstützt:

Chrome IE Edge Firefox Safari Opera
Yes Yes Yes Yes Yes Yes

Beispiel 2

<p>Input: <input type="number" id="toCheck" value="15"></p>

<button onclick="myFunction()">Test</button>

<p>Values higher: <span id="demo"></span></p>

<script>
const numbers = [4, 12, 16, 20];

function checkValue(x) {
  return x > document.getElementById("toCheck").value;
}

function myFunction() {
  document.getElementById("demo").innerHTML = numbers.some(checkValue);
}
</script>