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JavaScript Array some()

Příklad 1

Zkontrolujte, zda některé hodnoty nejsou vyšší než 18:

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

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

Definice a použití

Metoda some()kontroluje, zda nějaké prvky pole projdou testem (poskytován jako funkce).

Metoda some()provede funkci jednou pro každý prvek pole:

  • Pokud funkce vrátí true , some()vrátí true a zastaví se.
  • Pokud funkce vrátí hodnotu false , some()vrátí hodnotu false a zastaví se.

Metoda some()neprovádí funkci pro prázdné prvky pole.

Metoda some()nemění původní pole.


Syntax

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

Parametry

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.

Návratová hodnota

Typ Popis
Booleovský truepokud některý z prvků pole projde testem, jinak false.


Podpora prohlížeče

some()je funkce ECMAScript3 (ES3).

ES3 (JavaScript 1999) je plně podporován ve všech prohlížečích:

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

Příklad 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>