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ParseError

ParseError(msg)

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

Examples

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

User Contributed Notes

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