The expression passed to the parse function could not be interpreted as a valid Julia expression.


julia> parse("1 +")
ERROR: ParseError("expected a number or hexadecimal constant")

This example demonstrates a ParseError being thrown when attempting to parse the expression "1 +". The error message indicates that a number or hexadecimal constant was expected, but none was found.

julia> parse("println("Hello, World!")")
ERROR: ParseError("unexpected \")\"")

In this case, a ParseError is thrown when trying to parse the expression println("Hello, World!"). The error message indicates that an unexpected closing parenthesis ")" was encountered.

julia> expr = "2 + 2 * 3"
julia> parse(expr)
:(2 + (2 * 3))

Here, the parse function successfully parses the expression "2 + 2 * 3" and returns the corresponding Julia expression :(2 + (2 * 3)).

Common mistake example:

julia> parse("x + y")
ERROR: UndefVarError: x not defined

In this example, a ParseError is not explicitly thrown. However, the error message indicates an UndefVarError because the variables x and y are not defined. It's important to ensure that all variables used in the parsed expression are defined beforehand to avoid such errors.

See Also

ArgumentError, AssertionError, BoundsError, DivideError, DomainError, EOFError, error, ErrorException, InexactError, InitError, KeyError, LoadError, MethodError, OutOfMemoryError, OverflowError, ParseError, ReadOnlyMemoryError, showerror, StackOverflowError, SystemError, TypeError, UndefRefError, UndefVarError,

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