Replace Object with Map in your JavaScript code

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1. Map.size vs Object.keys(object).length

count map’s length by size property
Count object’s length
experiment comparing elapsed time counting length
Result Table

Map.has(key) vs Object.keys(object).includes(key)

map’s has property
map.has()

Map.delete(key) vs delete object[key]

map’s delete method

Map is iterable

for…of iterate Map

Relation with Array

Map to Array
Array to Map

Merge multiple Maps

merge maps
Browser support for Map

Conclusion

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