Document length functions - references #2

help/PersistentHashMap.fsx

@@ -12,7 +12,7 @@ A Map is a collection that maps keys to values. Hash maps require keys that corr
 
 open FSharpx.Collections.PersistentHashMap
 
-// Create a new map and add some items to it
+// Create a new HashMap and add some items to it
 let m = 
     empty 
     |> add 42 "hello"
@@ -27,6 +27,11 @@ find 99 m
 m.[99]
 // [fsi:val it : string = "world"]
 
+// Check no. of elements in the HashMap
+length m
+// [fsi:val it : int = 2]
+
+
 (**
 PersistentHashMaps are immutable and therefor allow to create new version without destruction of the old ones.
 *)
@@ -43,6 +48,11 @@ find 104 m'
 
 find 42 m
 // [fsi:val it : string = "hello"]
+length m
+// [fsi:val it : int = 2]
+length m'
+// [fsi:val it : int = 3]
+
 
 (** There a couple of interesting operations on HashMaps:
 *)

help/PersistentVector.fsx

@@ -12,7 +12,7 @@ A Vector is a collection of values indexed by contiguous integers. Vectors suppo
 
 open FSharpx.Collections.PersistentVector
 
-// Create a new vector and add some items to it
+// Create a new PersistentVector and add some items to it
 let v = 
     empty 
     |> conj "hello"
@@ -29,6 +29,11 @@ nth 1 v
 v.[2]
 // [fsi:val it : string = "!"]
 
+// Check no. of elements in the PersistentVector
+length v
+// [fsi:val it : int = 3]
+
+
 (**
 PersistentVectorss are immutable and therefor allow to create new version without destruction of the old ones.
 *)
@@ -45,6 +50,11 @@ nth 3 v'
 
 nth 0 v
 // [fsi:val it : string = "hello"]
+length v
+// [fsi:val it : int = 3]
+length v'
+// [fsi:val it : int = 4]
+
 
 (** There a couple of interesting operations on PersistentVectors:
 *)