陣列的concat()API有連線陣列的作用，並返回一個新陣列

<script>
    let joinTwoArrays = (arr1, arr2) => {
        return arr1.concat(arr2);
    }

    let arr1 = [1, 2, 3, 4, 5];
    let arr2 = [6, 7, 8, 9, 0];
    let arr3 = joinTwoArrays(arr1, arr2);
    console.log(arr3);
</script>
 

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