These three tips can help you to decide whether to use a Map or an Object: (This can be bypassed using map = Object.create(null).) An Object has a prototype, so there are default keys in the map.The iteration of maps is in insertion order of the elements.You can get the size of a Map easily, while you have to manually keep track of size for an Object.The keys of an Object are Strings or Symbols, where they can be of any value for a Map.Map objects, however, have a few more advantages that make them better maps. Objects allow you to set keys to values, retrieve those values, delete keys, and detect whether something is stored at a key. Traditionally, objects have been used to map strings to values. Enumerability and ownership of properties.
#SAVE DATABASE OBJECT IN ICOLLECTIONS CODE#
Warning: unreachable code after return statement. Warning: String.x is deprecated use instead. Warning: expression closures are deprecated. Warning: 08/09 is not a legal ECMA-262 octal constant. Warning: -file- is being assigned a //# sourceMappingURL, but already has one. TypeError: X.prototype.y called on incompatible type. TypeError: setting getter-only property "x". TypeError: Reduce of empty array with no initial value. TypeError: property "x" is non-configurable and can't be deleted. TypeError: invalid assignment to const "x". TypeError: invalid 'instanceof' operand 'x'. TypeError: cannot use 'in' operator to search for 'x' in 'y'. TypeError: can't redefine non-configurable property "x". TypeError: can't delete non-configurable array element. TypeError: can't define property "x": "obj" is not extensible. TypeError: can't convert BigInt to number. TypeError: can't assign to property "x" on "y": not an object. TypeError: "x" is not a non-null object. Synta圎rror: Using to indicate sourceURL pragmas is deprecated. Synta圎rror: unterminated string literal. Synta圎rror: unparenthesized unary expression can't appear on the left-hand side of '**'. Synta圎rror: Unexpected '#' used outside of class body. Synta圎rror: test for equality (=) mistyped as assignment (=)?. Synta圎rror: redeclaration of formal parameter "x". 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 element list. Synta圎rror: missing ) after argument list. Synta圎rror: missing : after property id. Synta圎rror: Malformed formal parameter. Synta圎rror: invalid regular expression flag "x". Synta圎rror: invalid assignment left-hand side. Synta圎rror: identifier starts immediately after numeric literal. Synta圎rror: function statement requires a name. Synta圎rror: for-in loop head declarations may not have initializers. Synta圎rror: cannot use `?` unparenthesized within `||` and `&` expressions. Synta圎rror: applying the 'delete' operator to an unqualified name is deprecated. 
Synta圎rror: a declaration in the head of a for-of loop can't have an initializer.Synta圎rror: "x" is a reserved identifier.Synta圎rror: "use strict" not allowed in function with non-simple parameters.Synta圎rror: "0"-prefixed octal literals and octal escape seq.ReferenceError: reference to undefined property "x".ReferenceError: deprecated caller or arguments usage.ReferenceError: can't access lexical declaration 'X' before initialization.ReferenceError: assignment to undeclared variable "x".RangeError: x can't be converted to BigInt because it isn't an integer.RangeError: repeat count must be non-negative.RangeError: repeat count must be less than infinity.RangeError: argument is not a valid code point.Error: Permission denied to access property "x".
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