Javascript

Variables

Summary

This page shows examples of how to declare and use variables in Javascript.

Discussion

• Declaring variables: const myVariable = ["item", 2, 4, "stuff"];

• Const declarations are immutable

  const a = 1
  a = 2 --> // error because we are redfining the variable
  

• let declartions are mutable

let a = 1
a = 2 --> // a, now returns 2

• Data types:
  • string: "stuff"
  • integer: 42
  • float: 3.14
  • bool: false
  • array: ["things", "go", "here"]

• Access items in an array through indices: myArray[0];

Examples

• String: const myString = 'hello';
• integer: const myInt = 42;
• float: const myFloat = 3.14;
• bool: let myBool = false;
• array: const myArray = ["things", "go", "here"];

References

• MDN: Variables