Untitled

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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>

    <script>

        var array = []
        array[0] = '1'
        array[1] = '2'
        array[2] = 'END1'
        array[3] = '3'
        array[4] = 'L'
        array[5] = '5'
        array[6] = 'M'
        array[7] = 'S'
        array[8] = 'END2'
        array[9] = '6'
        array[10] = '7'
        array[11] = '8'
        array[12] = '9'
        array[13] = 'END3'

        var which = 'first'
        var first = []
        var second = []
        var third = []

        for (index = 0; index < array.length; index++) {

            if (which == "first" && array[index] != "END1") {
                first.push(array[index])
            } else if (which == "second" && array[index] != "END2") {
                second.push(array[index])
            } else if (which == "third" && array[index] != "END3") {
                third.push(array[index])
            }

            if (array[index] == "END1") {
                which = 'second'
                continue
            } else if (array[index] == "END2") {
                which = 'third'
                continue
            } else if (array[index] == "END3") {
                break
            }
        }

        console.log(first)
        console.log(second)
        console.log(third)


    </script>

</body>

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