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# Day 18 - Promise
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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 17](./17_day_wep%20storege.md) | [Day 19 >>](./19_day_clouse.md)
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## Exercise Solutions
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### Exercises: Level 1
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1. Read the countries API using fetch and print the name of country, capital, languages, population and area.
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```js
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// app.js
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const countriesAPI = 'https://restcountries.com/v2/all'
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fetch('https://restcountries.com/v2/all')
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.then(response => response.json())
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.then(data => {
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data.forEach(country => {
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const name = country.name;
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const capital = country.capital;
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const languages = country.languages.map(language => language.name);
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const population = country.population;
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const region = country.region;
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console.log(`${name}, başkenti ${capital}'dir. Nüfusu ${population} ve bölgesi ${region}. Konuşulan diller: ${languages.join(', ')}`);
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});
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});
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```
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### Exercises: Level 2
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1. Print out all the cat names in to catNames variable.
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```js
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// app.js
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fetch('https://api.thecatapi.com/v1/breeds')
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.then(response => response.json())
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.then(data => {
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const catNames = data.map(cat => cat.name);
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console.log(catNames);
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});
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```
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### Exercises: Level 3
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1. Read the cats api and find the average weight of cat in metric unit.
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```js
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// app.js
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const catsAPI = 'https://api.thecatapi.com/v1/breeds'
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fetch('https://api.thecatapi.com/v1/breeds')
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.then(response => response.json())
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.then(data => {
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const weights = data.map(cat => cat.weight.metric);
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console.log(weights);
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});
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```
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2. Read the countries api and find out the 10 largest countries
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```js
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// app.js
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fetch('https://restcountries.com/v2/all')
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.then(response => response.json())
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.then(data => {
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data.sort((a, b) => b.area - a.area);
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const top10 = data.slice(0, 10);
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top10.forEach(country => {
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const name = country.name;
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const capital = country.capital;
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const languages = country.languages.map(language => language.name);
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const population = country.population;
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const region = country.region;
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console.log(`${name}, başkenti ${capital}'dir. Nüfusu ${population} ve bölgesi ${region}. Konuşulan diller: ${languages.join(', ')}`);
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});
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});
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```
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3. Read the countries api and count total number of languages in the world used as officials.
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```js
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// app.js
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fetch('https://restcountries.com/v2/all')
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.then(response => response.json())
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.then(data => {
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const languages = new Set();
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data.forEach(country => {
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country.languages.forEach(language => {
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languages.add(language.name);
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});
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});
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console.log(`Dünya genelinde resmi olarak kullanılan dillerin toplam sayısı: ${languages.size}`);
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});
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```
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#### [Home](../README.md) | [<< Day 17](./17_day_wep%20storege.md) | [Day 19 >>](./19_day_clouse.md) |
