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<html lang='uk'><body><h2>JavaScript Array.findIndex()</h2><p id="demo"></p><script>const numbers = [4, 9, 16, 25, 29];document.getElementById("demo").innerHTML = "First number over 18 has index " + numbers.findIndex(myFunction);function myFunction(value, index, array) { return value > 18;}</script></body></html>