function combinations(arr, len) {
    let tempArry = []
    let final = []
    for (let i = 0; i < arr.length; i++) {
        console.log("i ", i)
        if ((arr.length - i) == (len - 1)) {
            break
        }
        tempArry.push(arr[i])
        for (let j = i + 1; j < arr.length; j++) {
            console.log("j ", j)
            tempArry.push(arr[j])
            console.log("tempArry ", tempArry)
            if (tempArry.length == len) {
                console.log("tempArry inside if ", tempArry)
                final.push([...tempArry])
                console.log("final inside if ", final)
                tempArry.pop()
            }
        }
        tempArry = []
    }
    console.log("final ", final)
    return final
}
combinations([1, 2, 3, 4, 5], 3)