Module Belt.SortArray

Belt.SortArray

The top level provides some generic sort related utilities.

It also has two specialized inner modules Belt.SortArray.Int and Belt.SortArray.String

A module for Array sort relevant utiliites

module Int: { ... };

Specalized when key type is int, more efficient than the generic type

module String: { ... };

Specalized when key type is string, more efficient than the generic type

let strictlySortedLengthU: 
  array('a) =>
  Js.Fn.arity2(('a => 'a => bool)) =>
  int;

let strictlySortedLength: array('a) => ('a => 'a => bool) => int;

strictlySortedLenght xs cmp return +n means increasing order -n means negative order

   strictlySortedLength [|1;2;3;4;3|] (fun x y -> x < y) = 4;;
   strictlySortedLength [||] (fun x y -> x < y) = 0;;
   strictlySortedLength [|1|] (fun x y -> x < y) = 1;;
   strictlySortedLength [|4;3;2;1|] (fun x y -> x < y) = -4;;

let isSortedU: array('a) => Js.Fn.arity2(('a => 'a => int)) => bool;

let isSorted: array('a) => ('a => 'a => int) => bool;

isSorted arr cmp

returns true if array is increasingly sorted (equal is okay ) isSorted [|1;1;2;3;4|] (fun x y -> compare x y) = true

let stableSortInPlaceByU: array('a) => Js.Fn.arity2(('a => 'a => int)) => unit;

let stableSortInPlaceBy: array('a) => ('a => 'a => int) => unit;

stableSortBy xs cmp

Sort xs in place using comparator cmp, the stable means if the elements are equal, their order will be preserved

let stableSortByU: array('a) => Js.Fn.arity2(('a => 'a => int)) => array('a);

let stableSortBy: array('a) => ('a => 'a => int) => array('a);

stableSort xs cmp

returns a fresh array The same as stableSortInPlaceBy except that xs is not modified

let binarySearchByU: array('a) => 'a => Js.Fn.arity2(('a => 'a => int)) => int;

let binarySearchBy: array('a) => 'a => ('a => 'a => int) => int;

If value is not found and value is less than one or more elements in array, the negative number returned is the bitwise complement of the index of the first element that is larger than value.

If value is not found and value is greater than all elements in array, the negative number returned is the bitwise complement of (the index of the last element plus 1)

for example, if key is smaller than all elements return -1 since lnot (-1) = 0 if key is larger than all elements return - (len + 1) since lnot (-(len+1)) = len

  binarySearchBy [|1;2;3;4;33;35;36|] 33 = 4;;
  lnot (binarySearchBy [|1;3;5;7|] 4) = 2;;