js: fix rand build, properly use key values on map, add rand.string (#12020)

vlib/rand/rand.c.v

@@ -125,3 +125,16 @@ pub fn hex(len int) string {
 pub fn ascii(len int) string {
 	return string_from_set(ascii_chars, len)
 }
+
+fn deinit() {
+	unsafe {
+		default_rng.free() // free the implementation
+		free(default_rng) // free the interface wrapper itself
+	}
+}
+
+// init initializes the default RNG.
+fn init() {
+	default_rng = new_default()
+	C.atexit(deinit)
+}

vlib/rand/rand.js.v

@@ -0,0 +1,17 @@
+module rand
+
+// init initializes the default RNG.
+fn init() {
+	default_rng = new_default()
+}
+
+pub fn string(len int) string {
+	result := ''
+	#
+	#const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+	#const charactersLength = characters.length;
+	#for (let i = 0;i < len.val;i++)
+	#result.str += characters.charAt(Math.random() * charactersLength);
+
+	return result
+}

vlib/rand/rand.v

@@ -38,19 +38,6 @@ __global (
 	default_rng &PRNG
 )
 
-// init initializes the default RNG.
-fn init() {
-	default_rng = new_default()
-	C.atexit(deinit)
-}
-
-fn deinit() {
-	unsafe {
-		default_rng.free() // free the implementation
-		free(default_rng) // free the interface wrapper itself
-	}
-}
-
 // new_default returns a new instance of the default RNG. If the seed is not provided, the current time will be used to seed the instance.
 [manualfree]
 pub fn new_default(config config.PRNGConfigStruct) &PRNG {

vlib/rand/rand_test.js.v

@@ -0,0 +1,7 @@
+import rand
+
+fn test_string() {
+	res := rand.string(4)
+	assert res.len == 4
+	println(res)
+}

vlib/rand/wyrand/wyrand.js.v

@@ -0,0 +1,3 @@
+module wyrand
+
+pub fn (mut r WyRandRNG) free() {}

vlib/rand/wyrand/wyrand.v

@@ -250,9 +250,3 @@ pub fn (mut rng WyRandRNG) f64_in_range(min f64, max f64) f64 {
 	}
 	return min + rng.f64n(max - min)
 }
-
-// free should be called when the generator is no longer needed
-[unsafe]
-pub fn (mut rng WyRandRNG) free() {
-	unsafe { free(rng) }
-}

vlib/rand/wyrand/z_wyrand.c.v

@@ -0,0 +1,7 @@
+module wyrand
+
+// free should be called when the generator is no longer needed
+[unsafe]
+pub fn (mut rng WyRandRNG) free() {
+	unsafe { free(rng) }
+}