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JavaScript Array findIndex()

Contoh 1

Temukan elemen pertama dengan nilai di atas 18:

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

ages.findIndex(checkAge);

function checkAge(age) {
  return age > 18;
}

Definisi dan Penggunaan

Metode findIndex()mengeksekusi fungsi untuk setiap elemen array.

Metode findIndex()mengembalikan indeks (posisi) dari elemen pertama yang lulus tes.

Metode findIndex()mengembalikan -1 jika tidak ada kecocokan yang ditemukan.

Metode findIndex()tidak menjalankan fungsi untuk elemen array kosong.

Metode findIndex()ini tidak mengubah larik asli.


Sintaksis

array.findIndex(function(currentValue, index, arr), thisValue)

Parameter

Parameter Description
function() Required.
A function to be run for each array element.
currentValue Required.
The value of the current element.
index Optional.
The index of the current element.
arr Optional.
The array of the current element.
thisValue Optional. Default undefined.
A value passed to the function as its this value.

Nilai Kembali

Jenis Keterangan
Sebuah angka Indeks elemen pertama yang lulus tes.
Jika tidak -1.


Dukungan Peramban

findIndex() adalah fitur ECMAScript6 (ES6).

ES6 (JavaScript 2015) didukung di semua browser modern:

Chrome Edge Firefox Safari Opera
Yes Yes Yes Yes Yes

findIndex() tidak didukung di Internet Explorer 11 (atau lebih lama).


Lebih Banyak Contoh

Temukan elemen pertama dengan nilai di atas nilai input:

<p><input type="number" id="toCheck" value="18"></p>

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

<p>Any values above: <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.findIndex(checkValue);
}
</script>