findIndex < Array < JavaScript

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The findIndex() method of an array returns the index number of the first no in an array that is true in the provided function. If no element is true, -1 is returned. 

    
    const numbers = [5, 12, 8, 200, 44];

    const isLarge = (el) => el > 140;

    const findIndex = numbers.findIndex(isLarge);

    console.log(findIndex);
    // 3