JavaScript.

Core language of the web platform. Covers 15 sub-skills.

• JavaScript · 1 of 3

  Array Methods

  What does [1, 2, 3].includes(2) return?

  A2BfalseC1Dtrue

• JavaScript · 2 of 3

  Data Types & Coercion

  What does "b" + "a" + +"a" + "a" evaluate to?

  A"baaa"B"ba0a"Cthrows SyntaxError: invalid unary plus usageD"baNaNa"

• JavaScript · 3 of 3

  Error Handling

  What does the Error.captureStackTrace method do in V8 environments?

  AIt traces memory allocations in the function scopeBIt logs the error message to the debugger consoleCIt adds a .stack property from the call stackDIt catches the errors in the current call stack