Final answer:
True or False: let x = e1 in e2 is itself an expression? The answer is true. In computer science, let expressions are used to define local variables within a block of code.
Step-by-step explanation:
The answer is true. In computer science, let expressions are used to define local variables within a block of code. The syntax format varies depending on the programming language, but the concept is the same.
For example, in the programming language Haskell, the let expression allows you to define variables that can be used within the scope of the expression. Here's an example:
let x = 10 in x + 5
In this expression, the variable x is defined with a value of 10, and then it is used in the calculation x + 5. The let expression as a whole evaluates to the result of the calculation, which is 15.