26_Script.js

/* ES6 Collections */

/*
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                                Map Collection in ECMAScript
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 */

/*
Map is a collection of keyed data items,just like an Object.
But the main difference is that Map allows keys of any type.

new Map() – creates the map.
map.set(key, value) – stores the value by the key.
map.get(key) – returns the value by the key, undefined if key doesn’t exist in map.
map.has(key) – returns true if the key exists, false otherwise.
map.delete(key) – removes the value by the key.
map.clear() – clears the map
map.size – returns the current element count.
map.keys() – returns the keys for iteration,
map.values() – returns the values for iteration,
map.entries() – returns the entries [key, value], it’s used by default in for..of.

 */

/*
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                                Set Collection in ECMAScript
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 */

/*
A Set is a collection of values, where each value may occur only once.

Set contains the following methods

new Set(iterable) – creates the set, optionally from an array of values (any iterable will do).
set.add(value) – adds a value, returns the set itself.
set.delete(value) – removes the value, returns true if value existed at the moment of the call, otherwise false.
set.has(value) – returns true if the value exists in the set, otherwise false.
set.clear() – removes everything from the set.
set.size – is the elements count.

 */