Skip to main content
JAVASCRIPT-BASICS4 MIN READ

Sort values by type before truthiness

Classify common JavaScript values by their type and common condition-check risk.

Place each value or check into the bucket that describes the main risk when using it in a condition. Valid zero or empty-looking value Missing or not assigned Object reference Explicit boolean 0 as a quantity '' from an optional note field undefined from a missing property null returned for no selected user [] from an empty result list {} from an empty settings object false from an unchecked checkbox true from a feature toggle

Read the full lesson

Sign up free — one personalized lesson every day, matched to your role and goals.

Already have an account? Sign in

← Back to library
Contact us