JS Capsules: Maps

Introduction A Map is a collection of elements, where each element is stored as a key: value pair. By this definition, it can seem similar to an Object, but while a Map can accept any data type (both primitive values and objects) as its key, an Objec...

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Ridwan Olanrewaju

React Developer

Jul 6, 2022

Excellent article. I should mention though, that an Object can have a number as a property key.

For Example:

const x = { 7: "tight" } // undefined
x[7] // 'tight'

If the key is of type Number, it will be converted to a String. So the value of x['7'] is also 'tight'.

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JS Capsules: Maps

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