CODEWITHSUNDEEP
julia
Hoseung Choi
Hoseung Choi

Reputation: 1097

How to restore a over-written built-in function in Julia

The question may apply for other languages, too.

If I use a built-in function name as a variable name, I can restore the function by doing:

all = 123
all = Base.all

But If I define, for example, a custom function sum() and then I do,

sum = Base.sum

I got an error saying "invalid redefinition of constant sum"

Is there a way to restore a built-in function if I over-wrote it? Or is that impossible by design?

Upvotes: 4

Views: 464

Answers (2)

Alexander Morley
Alexander Morley

Reputation: 4181

For this example, you could just redefine sum as Base.sum:

sum(x) = Base.sum(x)

Is that what you would like?

NB. this may not "overwrite" your definition of sum. If it uses type parameters (e.g. sum(x::Vector) it may still be dispatched in preference to the general sum(x), in which case you would need to repeat the above for those specific methods.

Upvotes: 2

Scott Jones
Scott Jones

Reputation: 1750

If this is simply a problem for you when you are working in the REPL, and you don't mind losing all your other definitions, you could do workspace() to reset Main.

Upvotes: 1

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