JavaScript Essentials Quiz | GroovyGrails | GroovyGrails Tutorial Hub

1 Which keyword declares a block-scoped variable?

Avar Blet Cfunction Dglobal

2 What does '===' check that '==' does not?

AOnly value BValue and type (no coercion) COnly type DReference only

3 What is the result of typeof null?

A'null' B'object' C'undefined' D'number'

4 Which method adds an element to the end of an array?

Ashift() Bpush() Cpop() Dunshift()

5 What is a closure in JavaScript?

AA closed browser tab BA function that remembers its outer scope CA syntax error DA type of loop