Learning Julia

Short-circuit evaluation

In Julia, apart from the regular Boolean operators, such as true and false, we also have  && and ||.

The idea behind them is fairly simple:

• Looking at the var1 && var2 expression, var2 only gets executed if var1 evaluates to true

• Looking at the var1 || var2 expression, var2 only gets evaluated if var1 evaluates to false

To get a better understanding of the two, let's have a look at some code:

julia> isdigit("10") && println("Reached me!")
Reached me!

julia> isdigit("Ten") && println("Reached me!")
false

julia> isdigit("Ten") || println("Reached me!")
Reached me!

julia> isdigit("Ten") && println("Reached me!")
false

In the first line of code, the isdigit("10") function takes in a string value and checks whether ...