How to find the max no from an array without using Max() ?

I tried , using todatasubset() function with using for each

a!localVariables(
local!data: { 10, 5, 25, 70, 12 },
local!getdata: a!forEach(
items: local!data,
expression: { Maxnumber: fv!item }
),
index(
index(
todatasubset(
arrayToPage: local!getdata,
pagingConfiguration: a!pagingInfo(
startIndex: 1,
batchSize: 100,
sort: a!sortInfo(field: "Maxnumber", ascending: false)
)
).data,
"Maxnumber",
1
),
1,
{}
)
)

I am just curious about why would you like to do it without the max() function? Because even tho there are multiple ways of doing it, but none of them will be as efficient as the max() function.