JavaScript: Maps and Sets

Introduction

• Get to know JavaScript maps and sets
• What you should know

• The Map object defined
• Build your Map object with the set method
• Access a value with get
• Does the map have your key?
• Determine map size
• Remove key-value pairs with clear and delete
• Map: Keys and values methods
• Map contents with the entries method
• Loop over a map with forEach
• Challenge: Maps
• Solution: Maps

• What is the WeakMap object?
• Same methods, different map
• Challenge: WeakMaps
• Solution: WeakMaps

• The Set object defined
• Add values to your set
• Does Set have your value?
• Get your set size
• Delete and clear values in your set
• Iterate over values in a set
• Iterate over a set with entries
• Iterate over your set with forEach
• Challenge: Sets
• Solution: Sets

• What is the WeakSet object?
• Same methods, different set
• Challenge: WeakSets
• Solution: WeakSets

• Next steps