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JavaScript配列some()

例1

18を超える値があるかどうかを確認します。

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

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

定義と使用法

このsome()メソッドは、配列要素がテストに合格するかどうかをチェックします(関数として提供されます)。

このsome()メソッドは、配列要素ごとに関数を1回実行します。

  • 関数がtruesome()返す場合、trueを返し、停止します。
  • 関数がfalsesome()返す場合、falseを返し、停止します。

このsome()メソッドは、空の配列要素に対して関数を実行しません。

このsome()メソッドは元の配列を変更しません。


構文

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

パラメーター

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.

戻り値

タイプ 説明
ブール値 truearay要素のいずれかがテストに合格した場合、それ以外の場合はfalse


ブラウザのサポート

some()ECMAScript3(ES3)機能です。

ES3(JavaScript 1999)は、すべてのブラウザーで完全にサポートされています。

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

例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>