03-running-and-repl

Lesson 03: Running code & the REPL

Two ways to run JS: a file, or the interactive REPL.

What you'll learn

• node file.js runs a script
• node with no args opens the REPL (Read-Eval-Print-Loop)
• in the REPL, _ holds the last result
• .exit or Ctrl-D leaves the REPL

Example

See examples/.

Exercise

Open the REPL and compute the area of a circle radius 3.