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Sets are the new object type with the ES6 (ES2015) that allows creating collections of unique values. The values in the Set can be either simple primitives like strings or integers, but more complex nonprimitive types like object literals or arrays can also be part of a Set.
The syntax of Set is the following.
Key-value stores are essential and often used, especially in operations that require fast and frequent lookups. They allow an object - the key - to be mapped to another object, the value. This way, the values can easily be retrieved, by looking up the key.
In Java, the most popular
Map implementation is the
HashMap class. Aside from key-value mapping, it’s used in code that requires frequest insertions, updates and lookups. The insert and lookup time is a constant O(1).
In this tutorial, we’ll go over how to get the Keys and Values of a map in Java.
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