Lexical scope
Lexical scoping is a convention used by many languages that determine when an object is available by its name. When you run the code below you will see which x is available at different points in the code.
x <- 8
my_func <- function(y){
x <- 9
print(x)
y + x
}
my_func(x)
print(x)
Note that when we define x as 9, this is inside the function, but it is 8 after you run the function. The x changed inside the function but not outside.
This exercise is part of the course
Data Science R Basics
Exercise instructions
After running the code below, what is the value of x?
x <- 3
my_func <- function(y){
x <- 5
y
print(x)
}
my_func(x)
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Run this code
x <- 3
my_func <- function(y){
x <- 5
y+5
}
# Print the value of x