Main issue

An issue with the REPL workflow is that When sending a script (or any chunks) to the REPL, lines that produce error simply output that error and the REPL simply continues to execute the following lines. This can be quite problematic since we may not know why something isn’t working. Consider this example:

Error output

y = 5
y = y^x
# ERROR: UndefVarError: x not defined

ERROR: UndefVarError: x not defined

map(x->x, 1:100)

100-element Vector{Int64}:
   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
   ⋮
  92
  93
  94
  95
  96
  97
  98
  99
 100

z = y

5

Interactive errors

The way to solve this issue is to use the InteractiveErrors package, which halts the REPL until further action is taken:

using InteractiveErrors

y = y^x
# REPL halts at above, waiting for user input

ERROR: UndefVarError: x not defined

# ...
# once input is received, it continues
z = y;