MEPX
Chapter 6 of 16All chapters
  1. 1Introduction
  2. 2Syntax and statements
  3. 3Variables and scope
  4. 4Data types
  5. 5Comparison and coercion
  6. 6Strings
  7. 7Numbers and maths
  8. 8Arrays
  9. 9Objects
  10. 10Functions
  11. 11Conditions and loops
  12. 12Classes
  13. 13The DOM
  14. 14Events
  15. 15Promises and async
  16. 16Modules

Chapter 6 of 16

Strings

Quotes, templates and the useful methods.

Writing text

Single and double quotes behave identically. Backticks make a template literal, which can span lines and interpolate with ${}, so `Hello ${name}` reads better than joining with plus.

  • Strings are immutable, so every method returns a new string.
  • The plus operator joins if either side is a string, which is why "5" + 3 gives "53".

Methods worth knowing

slice takes a section, split turns text into an array, trim removes whitespace, and includes, startsWith and endsWith answer questions without a regular expression.