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# Day 10 - Set And Maps
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## [Exercise:Solutions](#exercise-solutions)
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- ### [Exercise:Level 1](#exercises-level-1)
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- ### [Exercise:Level 2](#exercises-level-2)
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- ### [Exercise:Level 3](#exercises-level-3) <hr>
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#### [Home](../README.md) | [<< Day 9](./09_day_callbac_function.md) | [Day 11 >>](./11_day_des_spreading.md)
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## Exercise Solutions
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### Exercises Level 1
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1. create an empty set
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```js
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// app.js
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const countries = new Set()
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console.log(countries)
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```
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2. Create a set containing 0 to 10 using loop
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```js
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// app.js
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const set = new Set()
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set.add(0,)
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set.add(1)
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set.add(2)
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set.add(3)
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set.add(4)
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set.add(5)
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set.add(6)
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set.add(7)
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set.add(8)
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set.add(9)
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set.add(10)
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console.log(set)
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```
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3. Remove an element from a set
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```js
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// app.js
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const set = new Set()
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set.add(0,)
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set.add(1)
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set.add(2)
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console.log(set.delete(1))
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```
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4. Clear a set
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```js
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// app.js
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const set = new Set()
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set.add(0,)
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set.add(1)
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set.add(2)
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set.clear()
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console.log(set)
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```
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5. Create a set of 5 string elements from array
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```js
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// app.js
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const arr = ['ayşe','fatma','dilan','cansu']
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const set = new Set(arr)
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console.log(set)
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```
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6. Create a map of countries and number of characters of a country
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```js
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// app.js
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const map = new Map()
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map.set(1,'turkey')
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map.set(2,'russıa')
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map.set(3,'germaby')
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console.log(map)
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```
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### Exercises Level 2
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1. Find a union b
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```js
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//app.js
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const a = [4, 5, 8, 9]
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const b = [3, 4, 5, 7]
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const c =[ ...a,...b
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]
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const A = new Set(a)
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const B = new Set(b)
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const C = new Set(c)
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console.log(C)
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```
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2. Find a intersection b
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```js
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//app.js
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const a = [4, 5, 8, 9]
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const b = [3, 4, 5, 7]
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const A = new Set(a)
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const B = new Set(b)
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const aUnionB =a.filter((num) => B.has(num))
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console.log(aUnionB)
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```
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3. Find a with b
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```js
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//app.js
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const a = [4, 5, 8, 9]
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const b = [3, 4, 5, 7]
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const A = new Set(a)
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const B = new Set(b)
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const aUnionB =a.filter((num) => !B.has(num))
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console.log(aUnionB)
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```
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### Exercises Level 3
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1. How many languages are there in the countries object file.
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2. Use the countries data to find the 10 most spoken languages:
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```
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// Your output should look like this
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console.log(mostSpokenLanguages(countries, 10))
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[
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{ English: 91 },
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{ French: 45 },
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{ Arabic: 25 },
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{ Spanish: 24 },
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{ Russian: 9 },
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{ Portuguese: 9 },
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{ Dutch: 8 },
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{ German: 7 },
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{ Chinese: 5 },
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{ Swahili: 4 },
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{ Serbian: 4 }
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]
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// Your output should look like this
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console.log(mostSpokenLanguages(countries, 3))
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[
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{English:91},
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{French:45},
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{Arabic:25}
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]
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```
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```js
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// app.js
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// Your output should look like this
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console.log(mostSpokenLanguages(countries, 10))
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[
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{ English: 91 },
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{ French: 45 },
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{ Arabic: 25 },
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{ Spanish: 24 },
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{ Russian: 9 },
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{ Portuguese: 9 },
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{ Dutch: 8 },
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{ German: 7 },
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{ Chinese: 5 },
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{ Swahili: 4 },
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{ Serbian: 4 }
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]
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// Your output should look like this
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console.log(mostSpokenLanguages(countries, 3))
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[
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{English:91},
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{French:45},
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{Arabic:25}
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]
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```
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#### [Home](../README.md) | [<< Day 9](./09_day_callbac_function.md) | [Day 11 >>](./11_day_des_spreading.md)
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