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Variables

  • Programming is the art of writing instructions to the computer such that it achieves your desired task.
  • Learning programming is a process of making mistakes and learning from them
  • Do NOT get discouraged when you can't solve a challenge.
  • A variable is used to store information so that you can use it and manipulate it later on.
  • let age = 21 creates an age variable that is 21.

Anatomy of variable declarations

  1. let is a keyword that we use to create a new variable.
  2. It is then followed by the name of the variable.
  3. Then followed by the equal sign = which assigns it (or gives it a value)
  4. Then followed by the value of the variable. Make sure to give descriptive names for your variables.

Variable Operations

  • The first time you define a variable, you have to define it with let.
  • The next time you use that variable, you should NOT use let anymore. Directly use the variable by its name.
  • variable + 3 performs an operation that adds 3 to the variable. It does NOT modify the variable.
  • Be careful of hardcoding. Do not replace variable + 3 with a number because we want our code to work for any value given to variable.

Addition and multiplication

  • The + operator adds the 2 numbers on its left and right
  • The * operator multiplies the 2 numbers on its left and right