FAQ: Introduction to R Syntax - Logical Operators

This community-built FAQ covers the “Logical Operators” exercise from the lesson “Introduction to R Syntax”.

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3 posts were split to a new topic: Cannot read property ‘0’ of null

Ok, so the solution to this one should be

if (weather == ‘cloudy’ & high_chance_of_rain) {
message <- “Pack umbrella!”
else {
message <- “No need for umbrella!”

But it keeps throwing an error, “cannot read property 0 of null”. So it turns out that if, as in the example above, the “else” block begins on the line below the curly brace that closes the if statement, the error pops up. However it doesn’t pop up if both the closing brace and the else statement are on the same line. Had to write it like that just so that it would let me move on to the next exercise.

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My code was:

if (weather == ‘cloudy’ & high_chance_of_rain) {
message <- “Pack an umbrella!”
} else {
message <- “No need for umbrella!”


but it was not accepted as a correct one - I got this message: Did you create a conditional statement and change the value of message to the string specified?

I see no difference in their solution and in my code. What am I missing?


Hello, @sabinapovhe899448947. Welcome to the forum!

The string specified in this case is, "Pack umbrella!" not "Pack an umbrella!"
Sometimes the SCT for the exercises is very picky. Happy coding!

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Oh wow, didn’t even notice this :open_mouth: thank you! :sunflower:

1 Like