1/6/2024 0 Comments Memory clean scriptThis algorithm reduces the definition of "an object is no longer needed" to "an object is unreachable". Circular references are a common cause of memory leaks. However, the reference-counting algorithm will not consider them reclaimable since each of the two objects has at least one reference pointing to them, resulting in neither of them being marked for garbage collection. At that point they become unneeded and their allocated memory should be reclaimed. They will go out of scope after the function call has completed. In the following example, two objects are created with properties that reference one another, thus creating a cycle. There is a limitation when it comes to circular references. Z = null // The 'a' property of the object originally in x // has zero references to it. However its 'a' property is still referenced by // the 'z' variable, so it cannot be freed. Y = "mozilla" // The object that was originally in 'x' has now zero // references to it. This object now has 2 references: one as a property, // the other as the 'z' variable. a // Reference to 'a' property of the object. X = 1 // Now, the object that was originally in 'x' has a unique reference // embodied by the 'y' variable. let y = x // The 'y' variable is the second thing that has a reference to the object. Obviously, none can be garbage-collected. The other is referenced by virtue of being assigned to the 'x' variable. One is referenced by the other as one of its properties. Enumerability and ownership of properties.Synta圎rror: unterminated string literal.Synta圎rror: unparenthesized unary expression can't appear on the left-hand side of '**'.Synta圎rror: function statement requires a name.ReferenceError: reference to undefined property "x".ReferenceError: assignment to undeclared variable "x".Synta圎rror: "use strict" not allowed in function with non-simple parameters.Warning: unreachable code after return statement.RangeError: repeat count must be less than infinity.Synta圎rror: "x" is a reserved identifier.TypeError: Reduce of empty array with no initial value.Synta圎rror: redeclaration of formal parameter "x".Error: Permission denied to access property "x".RangeError: argument is not a valid code point.TypeError: can't delete non-configurable array element.TypeError: "x" is not a non-null object.RangeError: repeat count must be non-negative.Synta圎rror: missing ) after argument list.Synta圎rror: missing = in const declaration.Synta圎rror: missing } after property list.Synta圎rror: missing } after function body.Synta圎rror: missing : after property id.Synta圎rror: missing ] after element list.Synta圎rror: Malformed formal parameter.TypeError: invalid 'instanceof' operand 'x'.Synta圎rror: a declaration in the head of a for-of loop can't have an initializer.Synta圎rror: for-in loop head declarations may not have initializers.TypeError: invalid assignment to const "x".Synta圎rror: invalid assignment left-hand side.TypeError: cannot use 'in' operator to search for 'x' in 'y'.Synta圎rror: identifier starts immediately after numeric literal.Synta圎rror: Unexpected '#' used outside of class body.TypeError: setting getter-only property "x".Synta圎rror: test for equality (=) mistyped as assignment (=)?.Warning: String.x is deprecated use instead.Synta圎rror: Using to indicate sourceURL pragmas is deprecated.Synta圎rror: "0"-prefixed octal literals and octal escape seq.Warning: expression closures are deprecated.ReferenceError: deprecated caller or arguments usage.Synta圎rror: applying the 'delete' operator to an unqualified name is deprecated.Synta圎rror: cannot use `?` unparenthesized within `||` and `&` expressions.TypeError: can't redefine non-configurable property "x".TypeError: property "x" is non-configurable and can't be deleted.TypeError: can't define property "x": "obj" is not extensible. ![]() TypeError: can't convert BigInt to number.RangeError: x can't be converted to BigInt because it isn't an integer.TypeError: can't assign to property "x" on "y": not an object.ReferenceError: can't access lexical declaration 'X' before initialization.TypeError: X.prototype.y called on incompatible type.Synta圎rror: invalid regular expression flag "x".Warning: 08/09 is not a legal ECMA-262 octal constant.Warning: -file- is being assigned a //# sourceMappingURL, but already has one.
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