v.gen.js: fix method calls and other codegen parts, rand module compiles (#11205)

vlib/builtin/js/array.js.v

@@ -84,11 +84,11 @@ fn (a &array) set_len(i int) {
 }
 
 pub fn (mut a array) sort_with_compare(compare voidptr) {
-	#a.arr.sort(compare)
+	#a.val.arr.sort(compare)
 }
 
 pub fn (mut a array) sort() {
-	#a.arr.sort($sortComparator)
+	#a.val.arr.sort($sortComparator)
 }
 
 pub fn (a array) index(v string) int {
@@ -110,16 +110,16 @@ pub fn (a array) slice(start int, end int) array {
 }
 
 pub fn (mut a array) insert(i int, val voidptr) {
-	#a.arr.splice(i,0,val)
+	#a.val.arr.splice(i,0,val)
 }
 
 pub fn (mut a array) insert_many(i int, val voidptr, size int) {
-	#a.arr.splice(i,0,...val.slice(0,+size))
+	#a.val.arr.splice(i,0,...val.slice(0,+size))
 }
 
 pub fn (mut a array) join(separator string) string {
 	mut res := ''
-	#res = new builtin.string(a.arr.join(separator +''));
+	#res = new builtin.string(a.val.arr.join(separator +''));
 
 	return res
 }
@@ -164,7 +164,7 @@ pub fn (mut a array) delete(i int) {
 
 // delete_many deletes `size` elements beginning with index `i`
 pub fn (mut a array) delete_many(i int, size int) {
-	#a.arr.splice(i.valueOf(),size.valueOf())
+	#a.val.arr.splice(i.valueOf(),size.valueOf())
 }
 
 // prepend prepends one value to the array.
@@ -186,7 +186,7 @@ pub fn (a array) reverse() array {
 }
 
 pub fn (mut a array) reverse_in_place() {
-	#a.arr.reverse()
+	#a.val.arr.reverse()
 }
 
 #array.prototype.$includes = function (elem) { return this.arr.find(function(e) { return vEq(elem,e); }) !== undefined;}
@@ -195,7 +195,7 @@ pub fn (mut a array) reverse_in_place() {
 // resulting in a single output value.
 pub fn (a array) reduce(iter fn (int, int) int, accum_start int) int {
 	mut accum_ := accum_start
-	#for (let i of a)  {
+	#for (let i = 0;i < a.arr.length;i++)  {
 	#accum_ = iter(accum_, a.arr[i])
 	#}
 
@@ -204,7 +204,7 @@ pub fn (a array) reduce(iter fn (int, int) int, accum_start int) int {
 
 pub fn (mut a array) pop() voidptr {
 	mut res := voidptr(0)
-	#res = a.arr.pop()
+	#res = a.val.arr.pop()
 
 	return res
 }
@@ -237,5 +237,5 @@ pub fn (a array) contains(key voidptr) bool {
 
 // delete_last effectively removes last element of an array.
 pub fn (mut a array) delete_last() {
-	#a.arr.pop();
+	#a.val.arr.pop();
 }

vlib/builtin/js/builtin.js.v

@@ -4,3 +4,35 @@ module builtin
 pub fn js_throw(s any) {
 	#throw (s instanceof Error ? s : new Error(s))
 }
+
+pub fn println(s any) {
+	$if js_freestanding {
+		#print(s.toString())
+	} $else {
+		#console.log(s.toString())
+	}
+}
+
+pub fn print(s any) {
+	$if js_node {
+		#$process.stdout.write(s.toString())
+	} $else {
+		panic('Cannot `print` in a browser, use `println` instead')
+	}
+}
+
+pub fn eprintln(s any) {
+	$if js_freestanding {
+		#print(s.toString())
+	} $else {
+		#console.error(s.toString())
+	}
+}
+
+pub fn eprint(s any) {
+	$if js_node {
+		#$process.stderr.write(s.toString())
+	} $else {
+		panic('Cannot `eprint` in a browser, use `println` instead')
+	}
+}

vlib/builtin/js/builtin.v

@@ -6,34 +6,6 @@ module builtin
 
 fn (a any) toString()
 
-pub fn println(s any) {
-	// Quickfix to properly print basic types
-	// TODO: Add proper detection code for this
-	JS.console.log(s.toString())
-}
-
-pub fn print(s any) {
-	// TODO
-	// $if js.node {
-	JS.process.stdout.write(s.toString())
-	// } $else {
-	//	panic('Cannot `print` in a browser, use `println` instead')
-	// }
-}
-
-pub fn eprintln(s any) {
-	JS.console.error(s.toString())
-}
-
-pub fn eprint(s any) {
-	// TODO
-	// $if js.node {
-	JS.process.stderr.write(s.toString())
-	// } $else {
-	//	panic('Cannot `eprint` in a browser, use `eprintln` instead')
-	// }
-}
-
 // Exits the process in node, and halts execution in the browser
 // because `process.exit` is undefined. Workaround for not having
 // a 'real' way to exit in the browser.

vlib/rand/config/config.v

@@ -0,0 +1,13 @@
+module config
+
+import rand.seed
+
+// PRNGConfigStruct is a configuration struct for creating a new instance of the default RNG.
+// Note that the RNGs may have a different number of u32s required for seeding. The default
+// generator WyRand used 64 bits, ie. 2 u32s so that is the default. In case your desired generator
+// uses a different number of u32s, use the `seed.time_seed_array()` method with the correct
+// number of u32s.
+pub struct PRNGConfigStruct {
+pub:
+	seed_ []u32 = seed.time_seed_array(2)
+}

vlib/rand/rand.v

@@ -3,18 +3,9 @@
 // that can be found in the LICENSE file.
 module rand
 
-import rand.seed
+import rand.config
 import rand.wyrand
 
-// PRNGConfigStruct is a configuration struct for creating a new instance of the default RNG.
-// Note that the RNGs may have a different number of u32s required for seeding. The default
-// generator WyRand used 64 bits, ie. 2 u32s so that is the default. In case your desired generator
-// uses a different number of u32s, use the `seed.time_seed_array()` method with the correct
-// number of u32s.
-pub struct PRNGConfigStruct {
-	seed_ []u32 = seed.time_seed_array(2)
-}
-
 // PRNG is a common interface for all PRNGs that can be used seamlessly with the rand
 // modules's API. It defines all the methods that a PRNG (in the vlib or custom made) must
 // implement in order to ensure that _all_ functions can be used with the generator.
@@ -52,7 +43,7 @@ fn init() {
 }
 
 // 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.
-pub fn new_default(config PRNGConfigStruct) &PRNG {
+pub fn new_default(config config.PRNGConfigStruct) &PRNG {
 	mut rng := &wyrand.WyRandRNG{}
 	rng.seed(config.seed_)
 	return rng

vlib/time/parse.js.v

@@ -0,0 +1,24 @@
+module time
+
+// parse returns time from a date string.
+//
+// TODO(playX): JS Date expects iso8061 format of strings and other formats
+// are implementation dependant, we probably want to implement parsing in JS.
+pub fn parse(s string) Time {
+	mut res := Time{}
+	#let date = new Date(s.str)
+	#res.year.val = date.getFullYear()
+	#res.month.val = date.getMonth()
+	#res.day.val = date.getDay()
+	#res.hour.val = date.getHours()
+	#res.minute.val = date.getMinutes()
+	#res.second.val = date.getSeconds()
+	#res.microsecond.val = date.getMilliseconds() * 1000
+	#res.unix.val = (date.getTime() / 1000).toFixed(0)
+
+	return res
+}
+
+pub fn parse_iso8601(s string) ?Time {
+	return parse(s)
+}

vlib/v/gen/js/builtin_types.v

@@ -304,8 +304,8 @@ fn (mut g JsGen) gen_builtin_type_defs() {
 				g.gen_builtin_prototype(
 					typ_name: typ_name
 					default_value: 'new Number(0)'
-					constructor: 'this.val = val | 0'
-					value_of: 'this.val | 0'
+					constructor: 'this.val = Number(val)'
+					value_of: 'Number(this.val)'
 					to_string: 'this.valueOf().toString()'
 					eq: 'this.valueOf() === other.valueOf()'
 					to_jsval: '+this'

vlib/v/gen/js/js.v

@@ -308,7 +308,7 @@ pub fn (mut g JsGen) init() {
 	g.definitions.writeln('"use strict";')
 	g.definitions.writeln('')
 	g.definitions.writeln('var \$global = (new Function("return this"))();')
-	g.definitions.writeln('function \$ref(value) { this.val = value; } ')
+	g.definitions.writeln('function \$ref(value) { if (value instanceof \$ref) { return value; } this.val = value; } ')
 	g.definitions.writeln('\$ref.prototype.valueOf = function() { return this.val; } ')
 	if g.pref.backend != .js_node {
 		g.definitions.writeln('const \$process = {')
@@ -736,17 +736,16 @@ fn (mut g JsGen) expr(node ast.Expr) {
 		}
 		ast.PrefixExpr {
 			if node.op in [.amp, .mul] {
-				// C pointers/references: ignore them
 				if node.op == .amp {
-					if !node.right_type.is_pointer() {
-						// kind of weird way to handle references but it allows us to access type methods easily.
-						g.write('(function(x) {')
-						g.write(' return { val: x, __proto__: Object.getPrototypeOf(x), valueOf: function() { return this.val; } }})(  ')
-						g.expr(node.right)
-						g.write(')')
-					} else {
-						g.expr(node.right)
-					}
+					// if !node.right_type.is_pointer() {
+					// kind of weird way to handle references but it allows us to access type methods easily.
+					g.write('(function(x) {')
+					g.write(' return { val: x, __proto__: Object.getPrototypeOf(x), valueOf: function() { return this.val; } }})(  ')
+					g.expr(node.right)
+					g.write(')')
+					//} else {
+					//		g.expr(node.right)
+					//	}
 				} else {
 					g.write('(')
 					g.expr(node.right)
@@ -1150,14 +1149,22 @@ fn (mut g JsGen) gen_method_decl(it ast.FnDecl) {
 		if args.len > 0 {
 			g.write(', ')
 		}
-		g.write('${it.params[0].name} = this')
+		if it.params[0].is_mut {
+			g.write('${it.params[0].name} = new \$ref(this)')
+		} else {
+			g.write('${it.params[0].name} = this')
+		}
 	}
 	g.writeln(') {')
 	for i, arg in args {
 		is_varg := i == args.len - 1 && it.is_variadic
+		name := g.js_name(arg.name)
 		if is_varg {
-			name := g.js_name(arg.name)
 			g.writeln('$name = new array($name);')
+		} else {
+			if arg.typ.is_ptr() || arg.is_mut {
+				g.writeln('$name = new \$ref($name)')
+			}
 		}
 	}
 
@@ -1514,7 +1521,141 @@ fn (mut g JsGen) gen_array_init_values(exprs []ast.Expr) {
 	g.write(']')
 }
 
+fn (mut g JsGen) gen_method_call(it ast.CallExpr) bool {
+	g.call_stack << it
+
+	mut name := g.js_name(it.name)
+	call_return_is_optional := it.return_type.has_flag(.optional)
+	if call_return_is_optional {
+		g.writeln('(function(){')
+		g.inc_indent()
+		g.writeln('try {')
+		g.inc_indent()
+		g.write('return builtin.unwrap(')
+	}
+	sym := g.table.get_type_symbol(it.receiver_type)
+	if sym.kind == .array {
+		if sym.kind == .array && it.name in ['map', 'filter'] {
+			g.expr(it.left)
+			mut ltyp := it.left_type
+			for ltyp.is_ptr() {
+				g.write('.val')
+				ltyp = ltyp.deref()
+			}
+			g.write('.')
+			// Prevent 'it' from getting shadowed inside the match
+			node := it
+			g.write(it.name)
+			g.write('(')
+			expr := node.args[0].expr
+			match expr {
+				ast.AnonFn {
+					g.gen_fn_decl(expr.decl)
+					g.write(')')
+					return true
+				}
+				ast.Ident {
+					if expr.kind == .function {
+						g.write(g.js_name(expr.name))
+						g.write(')')
+						return true
+					} else if expr.kind == .variable {
+						v_sym := g.table.get_type_symbol(expr.var_info().typ)
+						if v_sym.kind == .function {
+							g.write(g.js_name(expr.name))
+							g.write(')')
+							return true
+						}
+					}
+				}
+				else {}
+			}
+
+			g.write('it => ')
+			g.expr(node.args[0].expr)
+			g.write(')')
+			return true
+		}
+
+		left_sym := g.table.get_type_symbol(it.left_type)
+		if left_sym.kind == .array {
+			if it.name in special_array_methods {
+				g.expr(it.left)
+				mut ltyp := it.left_type
+				for ltyp.is_ptr() {
+					g.write('.val')
+					ltyp = ltyp.deref()
+				}
+				g.write('.')
+
+				g.gen_array_method_call(it)
+				return true
+			}
+		}
+	}
+	// interfaces require dynamic dispatch. To obtain method table we use getPrototypeOf
+	g.write('Object.getPrototypeOf(')
+	g.expr(it.left)
+	mut ltyp := it.left_type
+	for ltyp.is_ptr() {
+		g.write('.val')
+		ltyp = ltyp.deref()
+	}
+	g.write(').$name .call(')
+	g.expr(it.left)
+	g.write(',')
+	for i, arg in it.args {
+		g.expr(arg.expr)
+		if i != it.args.len - 1 {
+			g.write(', ')
+		}
+	}
+	// end method call
+	g.write(')')
+
+	if call_return_is_optional {
+		// end unwrap
+		g.writeln(')')
+		g.dec_indent()
+		// begin catch block
+		g.writeln('} catch(err) {')
+		g.inc_indent()
+		// gen or block contents
+		match it.or_block.kind {
+			.block {
+				if it.or_block.stmts.len > 1 {
+					g.stmts(it.or_block.stmts[..it.or_block.stmts.len - 1])
+				}
+				g.write('return ')
+				g.stmt(it.or_block.stmts.last())
+			}
+			.propagate {
+				panicstr := '`optional not set (\${err})`'
+				if g.file.mod.name == 'main' && g.fn_decl.name == 'main.main' {
+					g.writeln('return builtin.panic($panicstr)')
+				} else {
+					g.writeln('builtin.js_throw(err)')
+				}
+			}
+			else {}
+		}
+		// end catch
+		g.dec_indent()
+		g.writeln('}')
+		// end anon fn
+		g.dec_indent()
+		g.write('})()')
+	}
+	g.call_stack.delete_last()
+	return true
+}
+
 fn (mut g JsGen) gen_call_expr(it ast.CallExpr) {
+	if it.is_method {
+		if g.gen_method_call(it) {
+			return
+		}
+	}
 	g.call_stack << it
 	mut name := g.js_name(it.name)
 	call_return_is_optional := it.return_type.has_flag(.optional)
@@ -1525,59 +1666,13 @@ fn (mut g JsGen) gen_call_expr(it ast.CallExpr) {
 		g.inc_indent()
 		g.write('return builtin.unwrap(')
 	}
+
 	g.expr(it.left)
 
-	if it.is_method { // foo.bar.baz()
-		sym := g.table.get_type_symbol(it.receiver_type)
-		g.write('.')
-		if sym.kind == .array && it.name in ['map', 'filter'] {
-			// Prevent 'it' from getting shadowed inside the match
-			node := it
-			g.write(it.name)
-			g.write('(')
-			expr := node.args[0].expr
-			match expr {
-				ast.AnonFn {
-					g.gen_fn_decl(expr.decl)
-					g.write(')')
-					return
-				}
-				ast.Ident {
-					if expr.kind == .function {
-						g.write(g.js_name(expr.name))
-						g.write(')')
-						return
-					} else if expr.kind == .variable {
-						v_sym := g.table.get_type_symbol(expr.var_info().typ)
-						if v_sym.kind == .function {
-							g.write(g.js_name(expr.name))
-							g.write(')')
-							return
-						}
-					}
-				}
-				else {}
-			}
-
-			g.write('it => ')
-			g.expr(node.args[0].expr)
-			g.write(')')
-			return
-		}
-
-		left_sym := g.table.get_type_symbol(it.left_type)
-		if left_sym.kind == .array {
-			node := it
-			if node.name in special_array_methods {
-				g.gen_array_method_call(it)
-				return
-			}
-		}
-	} else {
-		if name in g.builtin_fns {
-			g.write('builtin.')
-		}
+	if name in g.builtin_fns {
+		g.write('builtin.')
 	}
+
 	g.write('${name}(')
 	for i, arg in it.args {
 		g.expr(arg.expr)
@@ -1782,6 +1877,14 @@ fn (mut g JsGen) gen_index_expr(expr ast.IndexExpr) {
 	}
 }
 
+fn (mut g JsGen) gen_deref_ptr(ty ast.Type) {
+	mut t := ty
+	for t.is_ptr() {
+		g.write('.val')
+		t = t.deref()
+	}
+}
+
 fn (mut g JsGen) gen_infix_expr(it ast.InfixExpr) {
 	l_sym := g.table.get_type_symbol(it.left_type)
 	r_sym := g.table.get_type_symbol(it.right_type)
@@ -1804,10 +1907,12 @@ fn (mut g JsGen) gen_infix_expr(it ast.InfixExpr) {
 		g.cast_stack << greater_typ
 		g.write('BigInt((')
 		g.expr(it.left)
+		g.gen_deref_ptr(it.left_type)
 		g.write(').\$toJS())')
 		g.write(' $it.op ')
 		g.write('BigInt((')
 		g.expr(it.right)
+		g.gen_deref_ptr(it.right_type)
 		g.write(').\$toJS())')
 		g.cast_stack.delete_last()
 		g.write(')')
@@ -1820,30 +1925,41 @@ fn (mut g JsGen) gen_infix_expr(it ast.InfixExpr) {
 		has_operator_overloading := g.table.type_has_method(l_sym, '==')
 		if has_operator_overloading {
 			g.expr(it.left)
+			g.gen_deref_ptr(it.left_type)
 			g.write('.eq(')
 			g.expr(it.right)
+			g.gen_deref_ptr(it.right_type)
 			g.write(')')
 			// Shallow equatables
 		} else if l_sym.kind in js.shallow_equatables && r_sym.kind in js.shallow_equatables {
 			// wrap left expr in parens so binary operations will work correctly.
 			g.write('(')
 			g.expr(it.left)
+			g.gen_deref_ptr(it.left_type)
 			g.write(')')
 			g.write('.eq(')
 			g.cast_stack << int(l_sym.kind)
 			g.expr(it.right)
+			g.gen_deref_ptr(it.right_type)
 			g.cast_stack.delete_last()
 			g.write(')')
 		} else {
 			g.write('vEq(')
 			g.expr(it.left)
+			g.gen_deref_ptr(it.left_type)
 			g.write(', ')
 			g.expr(it.right)
+			g.gen_deref_ptr(it.right_type)
 			g.write(')')
 		}
 	} else if l_sym.kind == .array && it.op == .left_shift { // arr << 1
 		g.write('Array.prototype.push.call(')
 		g.expr(it.left)
+		mut ltyp := it.left_type
+		for ltyp.is_ptr() {
+			g.write('.val')
+			ltyp = ltyp.deref()
+		}
 		g.write('.arr,')
 		array_info := l_sym.info as ast.Array
 		// arr << [1, 2]
@@ -1854,6 +1970,12 @@ fn (mut g JsGen) gen_infix_expr(it ast.InfixExpr) {
 		g.write(')')
 	} else if r_sym.kind in [.array, .map, .string] && it.op in [.key_in, .not_in] {
 		g.expr(it.right)
+
+		mut ltyp := it.right_type
+		for ltyp.is_ptr() {
+			g.write('.val')
+			ltyp = ltyp.deref()
+		}
 		if r_sym.kind == .map {
 			g.write('.map.has(')
 		} else if r_sym.kind == .string {
@@ -1868,6 +1990,7 @@ fn (mut g JsGen) gen_infix_expr(it ast.InfixExpr) {
 		g.write(')')
 	} else if it.op in [.key_is, .not_is] { // foo is Foo
 		g.expr(it.left)
+		g.gen_deref_ptr(it.left_type)
 		g.write(' instanceof ')
 		g.write(g.typ(it.right_type))
 	} else if it.op in [.lt, .gt, .ge, .le] && g.table.type_has_method(l_sym, '<')
@@ -1877,19 +2000,24 @@ fn (mut g JsGen) gen_infix_expr(it ast.InfixExpr) {
 		}
 		if it.op in [.lt, .ge] {
 			g.expr(it.left)
+			g.gen_deref_ptr(it.left_type)
 			g.write('.\$lt (')
 			g.expr(it.right)
+			g.gen_deref_ptr(it.right_type)
 			g.write(')')
 		} else {
 			g.expr(it.right)
+			g.gen_deref_ptr(it.right_type)
 			g.write('.\$lt (')
 			g.expr(it.left)
+			g.gen_deref_ptr(it.left_type)
 			g.write(')')
 		}
 	} else {
 		has_operator_overloading := g.table.type_has_method(l_sym, it.op.str())
 		if has_operator_overloading {
 			g.expr(it.left)
+			g.gen_deref_ptr(it.left_type)
 			name := match it.op.str() {
 				'+' {
 					'\$add'
@@ -1913,6 +2041,7 @@ fn (mut g JsGen) gen_infix_expr(it ast.InfixExpr) {
 			}
 			g.write('.$name (')
 			g.expr(it.right)
+			g.gen_deref_ptr(it.right_type)
 			g.write(')')
 		} else {
 			mut greater_typ := 0
@@ -1933,10 +2062,11 @@ fn (mut g JsGen) gen_infix_expr(it ast.InfixExpr) {
 			}
 
 			g.expr(it.left)
-
+			g.gen_deref_ptr(it.left_type)
 			g.write(' $it.op ')
 
 			g.expr(it.right)
+			g.gen_deref_ptr(it.right_type)
 
 			if is_arithmetic {
 				g.cast_stack.delete_last()
@@ -2033,8 +2163,10 @@ fn (mut g JsGen) gen_map_init_expr(it ast.MapInit) {
 
 fn (mut g JsGen) gen_selector_expr(it ast.SelectorExpr) {
 	g.expr(it.expr)
-	if it.expr_type.is_ptr() {
-		g.write('.valueOf()')
+	mut ltyp := it.expr_type
+	for ltyp.is_ptr() {
+		g.write('.val')
+		ltyp = ltyp.deref()
 	}
 	g.write('.$it.field_name')
 }
@@ -2078,7 +2210,8 @@ fn (mut g JsGen) gen_string_inter_literal(it ast.StringInterLiteral) {
 }
 
 fn (mut g JsGen) gen_string_literal(it ast.StringLiteral) {
-	text := it.val.replace("'", "\\'")
+	mut text := it.val.replace("'", "'")
+	text = text.replace('"', '\\"')
 	should_cast := !(g.cast_stack.len > 0 && g.cast_stack.last() == ast.string_type_idx)
 	if true || should_cast {
 		if g.file.mod.name == 'builtin' {
@@ -2086,7 +2219,7 @@ fn (mut g JsGen) gen_string_literal(it ast.StringLiteral) {
 		}
 		g.write('string(')
 	}
-	g.write("'$text'")
+	g.write("\"$text\"")
 	if true || should_cast {
 		g.write(')')
 	}
@@ -2166,6 +2299,9 @@ fn (mut g JsGen) gen_type_cast_expr(it ast.CastExpr) {
 	g.cast_stack << it.typ
 	typ := g.typ(it.typ)
 	if !is_literal {
+		if it.typ.is_ptr() {
+			g.write('new \$ref(')
+		}
 		if typ !in js.v_types || g.ns.name == 'builtin' {
 			g.write('new ')
 		}
@@ -2177,6 +2313,9 @@ fn (mut g JsGen) gen_type_cast_expr(it ast.CastExpr) {
 	}
 	if !is_literal {
 		g.write(')')
+		if it.typ.is_ptr() {
+			g.write(')')
+		}
 	}
 	g.cast_stack.delete_last()
 }

vlib/v/gen/js/tests/testdata/array.out

@@ -60,16 +60,16 @@ true
 0
 1
 1.1
-[1, 2, 3, 4]
-[1, 5, 6, 2, 3, 4]
+[[1, 2], 3, 4]
+[[1, 2], [5, 6], 3, 4]
 0
 1
 1
 0
 1
 1.1
-[1, 2, 3, 4]
-[5, 6, 1, 2, 3, 4]
+[[1, 2], 3, 4]
+[[5, 6], [1, 2], 3, 4]
 5
 true
 1.1
@@ -152,11 +152,11 @@ true
 true
 true
 true
-0
-0
-0
-0
-0
+15
+20
+14
+-6
+-7
 [2, 4, 6]
 [is, awesome]
 [2, 3, 4, 6, 8, 9, 10]
@@ -278,9 +278,9 @@ a
 123
 123
 [[1, 2, 3]]
+[[[1, 2, 3]]]
 [[1, 2, 3]]
-[[1, 2, 3]]
-[[1, 2, 3]]
+[[[1, 2, 3]]]
 true
 true
 true