This smells a little bit like homework, but it sounds like you're on the right track. Array.choose and Array.filter are good ways to start with an array and wind up with a smaller array.
Since you have 2 arrays to start, a common idiom is to first combine them into one array of tuples, and then process the combined array. The code below shows a couple ways you can combine them (via either 'map2' or 'zip'). Once you have the 'both' array, do you see a way to use choose or filter to get the final answer?
let choseArray = [| 1; 1; 0 |]
let totalArray = [| "A"; "B"; "C" |]
//let both = Array.map2 (fun x y -> (x,y)) choseArray totalArray
let both = Array.zip choseArray totalArray
printfn "%A" both // [|(1, "A"); (1, "B"); (0, "C")|]
Hello,
Thank you very much.
I have figured out:
let pickArray = Array.choose(fun elem -> if fst(elem) = 1 then Some(snd(elem))
else None) both
printfn "PickArray = %A" pickArray
It seems to be easy, but difficult to firuge out, esp. when I don't know how to make the "both" Array.
Thanks again!
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Hello,
I want to write a
function to do the following:
+++++++++++++++++++++++++++++++
let choseArray = [| 1; 0; 1|]
let totalArray = [| "A"; "B"; "C" |]
I want to create a new string array: if the corresponding position of totalArray
in choseArray is 1, then include this element from exchange, if it is 0,
exclude it. Let’s assume totalArray and
choseArray contain the same number of elements, and totalArray is always the
same, but choseArray can be different for different conditions:
So the new array from the above example is:
pickArray =
[|"A"; "C"|]
And in the following conditions:
let choseArray = [| 1; 1; 0|]
let totalArray = [| "A"; "B"; "C" |]
Then: pickArray = [|"A"; "B"|]
Besides, in this conditions:
let choseArray = [| 1; 1; 1|]
let totalArray = [| "A"; "B"; "C" |]
Then: pickArray = [|"A"; "B";
"C"|]<br style="">
<br style="">
Finally, in this conditions:
let choseArray = [| 0; 0; 0|]
let totalArray = [| "A"; "B"; "C" |]
Then: pickArray = [||]
++++++++++++++++++++++++++++++++++++++
I think I could use Array.choose, but since it concerns with 2 arrays, I can’t figure
it out.
Any help is greatly
appreciated!