iterator = "symbol" // Undefined typeof undefined = "undefined" typeof declaredButUndefinedVariable = "undefined" typeof undeclaredVariable = "undefined" // Objects typeof const baseType = typeof value // Primitive types if ( !. LN2 = "number" typeof Infinity = "number" typeof NaN = "number" // Despite being "Not-A-Number" typeof Number ( "1" ) = "number" // Number tries to parse things into numbers typeof Number ( "shoe" ) = "number" // including values that cannot be type coerced to a number typeof 42n = "bigint" // Strings typeof "" = "string" typeof "bla" = "string" typeof ` template literal ` = "string" typeof "1" = "string" // note that a number within a string is still typeof string typeof typeof 1 = "string" // typeof always returns a string typeof String ( 1 ) = "string" // String converts anything into a string, safer than toString // Booleans typeof true = "boolean" typeof false = "boolean" typeof Boolean ( 1 ) = "boolean" // Boolean() will convert values based on if they're truthy or falsy typeof ! ! 1 = "boolean" // two calls of the ! (logical NOT) operator are equivalent to Boolean() // Symbols typeof Symbol ( ) = "symbol" typeof Symbol ( "foo" ) = "symbol" typeof Symbol. Numbers typeof 37 = "number" typeof 3.14 = "number" typeof 42 = "number" typeof Math. Enumerability and ownership of properties.
Type o negative symbol code#
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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