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tshemsedinovtshemsedinov
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Fix code style
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6 files changed

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lines changed

6 files changed

+293
-2
lines changed

‎JavaScript/9-timer-iterable.js

Lines changed: 29 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,7 @@
11
'use strict';
22

3+
const { setTimeout } = require('node:timers/promises');
4+
35
class Timer {
46
#counter = 0;
57
#resolve = null;
@@ -29,8 +31,33 @@ class Timer {
2931

3032
const main = async () => {
3133
const timer = new Timer(1000);
32-
for await (const step of timer) {
33-
console.log({ step });
34+
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{
36+
console.log('start 1');
37+
for await (const step of timer) {
38+
console.log({ for: 1, step });
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}
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}
41+
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{
43+
console.log('start 2');
44+
const iter = timer[Symbol.asyncIterator]();
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do {
46+
console.log({ for: 2, iter });
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const { value, done } = await iter.next();
48+
console.log({ for: 2, step: value });
49+
} while (true);
50+
}
51+
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{
53+
console.log('start 3');
54+
const iter = timer[Symbol.asyncIterator]();
55+
do {
56+
console.log({ for: 3, iter });
57+
const { value, done } = await iter.next();
58+
const a = await iter.next();
59+
console.log({ for: 3, step: value });
60+
} while (true);
3461
}
3562
};
3663

‎JavaScript/Tasks/Refactoring/1-srp-problem.js

Lines changed: 35 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,35 @@
1+
'use strict';
2+
3+
const API_EXCHANGE = {
4+
host: 'openexchangerates.org',
5+
path: 'api/latest.json?app_id=',
6+
key: '1f43ea96b1e343fe94333dd2b97a109d',
7+
};
8+
9+
const DEFAULT_RETRY = 3;
10+
11+
const getRate = async (currency, retry = DEFAULT_RETRY) => {
12+
console.log({ currency, retry });
13+
const { host, path, key } = API_EXCHANGE;
14+
const url = `https://${host}/${path}${key}`;
15+
const res = await fetch(url).catch(() => ({ ok: false }));
16+
if (!res.ok) {
17+
const attemptsLeft = retry - 1;
18+
if (attemptsLeft > 0) return getRate(currency, retry - 1);
19+
throw new Error('Can not get data');
20+
}
21+
const data = await res.json();
22+
const rate = data.rates[currency];
23+
return rate;
24+
};
25+
26+
const main = async () => {
27+
try {
28+
const rate = await getRate('UAH');
29+
console.log({ rate });
30+
} catch (err) {
31+
console.error({ err });
32+
}
33+
};
34+
35+
main();

‎JavaScript/Tasks/Refactoring/1-srp-solution.js

Lines changed: 40 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,40 @@
1+
'use strict';
2+
3+
const API_EXCHANGE = {
4+
host: 'openexchangerates.org',
5+
path: 'api/latest.json?app_id=',
6+
key: '1f43ea96b1e343fe94333dd2b97a109d',
7+
};
8+
9+
const DEFAULT_RETRY = 3;
10+
11+
const httpGet = async ({ url, retry = DEFAULT_RETRY }) => {
12+
console.log({ url, retry });
13+
const res = await fetch(url).catch(() => ({ ok: false }));
14+
if (!res.ok) {
15+
const attemptsLeft = retry - 1;
16+
if (attemptsLeft > 0) return httpGet({ url, retry: attemptsLeft });
17+
throw new Error('Can not get data');
18+
}
19+
return res.json();
20+
};
21+
22+
const getRate = async (currency) => {
23+
console.log({ currency });
24+
const { host, path, key } = API_EXCHANGE;
25+
const url = `https://${host}/${path}${key}`;
26+
const data = await httpGet({ url });
27+
const rate = data.rates[currency];
28+
return rate;
29+
};
30+
31+
const main = async () => {
32+
try {
33+
const rate = await getRate('UAH');
34+
console.log({ rate });
35+
} catch (err) {
36+
console.error({ err });
37+
}
38+
};
39+
40+
main();

‎JavaScript/Tasks/Refactoring/2-ocp-problem.js

Lines changed: 69 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,69 @@
1+
'use strict';
2+
3+
const MOCK_DATASET = [
4+
{ name: 'Rome', population: 2761632, country: 10, type: 1 },
5+
{ name: 'Milan', population: 1371498, country: 10, type: 1 },
6+
{ name: 'Naples', population: 914758, country: 10, type: 1 },
7+
{ name: 'Turin', population: 848885, country: 10, type: 1 },
8+
{ name: 'Palermo', population: 630828, country: 10, type: 1 },
9+
{ name: 'Genoa', population: 560688, country: 10, type: 1 },
10+
{ name: 'Bologna', population: 392203, country: 10, type: 1 },
11+
{ name: 'Florence', population: 367150, country: 10, type: 1 },
12+
{ name: 'Bari', population: 316140, country: 10, type: 1 },
13+
{ name: 'Catania', population: 298324, country: 10, type: 1 },
14+
];
15+
16+
const MOCK_TIMEOUT = 1000;
17+
18+
class Query {
19+
constructor(table) {
20+
this.options = { table, fields: ['*'], where: {} };
21+
}
22+
23+
where(conditions) {
24+
Object.assign(this.options.where, conditions);
25+
return this;
26+
}
27+
28+
order(field) {
29+
this.options.order = field;
30+
return this;
31+
}
32+
33+
limit(count) {
34+
this.options.limit = count;
35+
return this;
36+
}
37+
38+
then(resolve) {
39+
const { table, fields, where, limit, order } = this.options;
40+
const cond = Object.entries(where).map((e) => e.join('=')).join(' AND ');
41+
const sql = `SELECT ${fields} FROM ${table} WHERE ${cond}`;
42+
const opt = `ORDER BY ${order} LIMIT ${limit}`;
43+
const query = sql + ' ' + opt;
44+
setTimeout(() => {
45+
resolve({ query, dataset: MOCK_DATASET });
46+
}, MOCK_TIMEOUT);
47+
}
48+
}
49+
50+
// Usage
51+
52+
(async () => {
53+
54+
const cities = await new Query('cities')
55+
.where({ country: 10, type: 1 })
56+
.order('population')
57+
.limit(10)
58+
.then((result) => {
59+
const projection = new Map();
60+
for (const record of result.dataset) {
61+
const { name, population } = record;
62+
projection.set(name, population);
63+
}
64+
return projection;
65+
});
66+
67+
console.log(cities);
68+
69+
})();

‎JavaScript/Tasks/Refactoring/2-ocp-solution.js

Lines changed: 72 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,72 @@
1+
'use strict';
2+
3+
const MOCK_DATASET = [
4+
{ name: 'Rome', population: 2761632, country: 10, type: 1 },
5+
{ name: 'Milan', population: 1371498, country: 10, type: 1 },
6+
{ name: 'Naples', population: 914758, country: 10, type: 1 },
7+
{ name: 'Turin', population: 848885, country: 10, type: 1 },
8+
{ name: 'Palermo', population: 630828, country: 10, type: 1 },
9+
{ name: 'Genoa', population: 560688, country: 10, type: 1 },
10+
{ name: 'Bologna', population: 392203, country: 10, type: 1 },
11+
{ name: 'Florence', population: 367150, country: 10, type: 1 },
12+
{ name: 'Bari', population: 316140, country: 10, type: 1 },
13+
{ name: 'Catania', population: 298324, country: 10, type: 1 },
14+
];
15+
16+
const MOCK_TIMEOUT = 1000;
17+
18+
class Query {
19+
constructor(table) {
20+
this.options = { table, fields: ['*'], where: {} };
21+
}
22+
23+
where(conditions) {
24+
Object.assign(this.options.where, conditions);
25+
return this;
26+
}
27+
28+
order(field) {
29+
this.options.order = field;
30+
return this;
31+
}
32+
33+
limit(count) {
34+
this.options.limit = count;
35+
return this;
36+
}
37+
38+
then(resolve) {
39+
const { table, fields, where, limit, order } = this.options;
40+
const cond = Object.entries(where).map((e) => e.join('=')).join(' AND ');
41+
const sql = `SELECT ${fields} FROM ${table} WHERE ${cond}`;
42+
const opt = `ORDER BY ${order} LIMIT ${limit}`;
43+
const query = sql + ' ' + opt;
44+
return new Promise((fulfill) => {
45+
setTimeout(() => {
46+
const result = { query, dataset: MOCK_DATASET };
47+
fulfill(resolve(result));
48+
}, MOCK_TIMEOUT);
49+
});
50+
}
51+
}
52+
53+
// Usage
54+
55+
(async () => {
56+
57+
const cities = await new Query('cities')
58+
.where({ country: 10, type: 1 })
59+
.order('population')
60+
.limit(10)
61+
.then((result) => {
62+
const projection = new Map();
63+
for (const record of result.dataset) {
64+
const { name, population } = record;
65+
projection.set(name, population);
66+
}
67+
return projection;
68+
});
69+
70+
console.log(cities);
71+
72+
})();

‎JavaScript/Tasks/Refactoring/3-lsp-problem.js

Lines changed: 48 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,48 @@
1+
'use strict';
2+
3+
const fs = require('node:fs');
4+
const stream = require('node:stream');
5+
const { Console } = require('node:console');
6+
const PATH = process.cwd();
7+
8+
const shortenPath = new stream.Transform({
9+
transform(chunk, encoding, callback) {
10+
const line = String(chunk)
11+
.replaceAll(PATH, '')
12+
.replaceAll('\n', ' ')
13+
.replaceAll(' ', ' ')
14+
.trim();
15+
callback(null, line);
16+
},
17+
});
18+
19+
const TIME_START = 11;
20+
const TIME_END = 19;
21+
22+
const getTimestamp = () => {
23+
const time = new Date().toISOString();
24+
return time.substring(TIME_START, TIME_END);
25+
};
26+
27+
const addTimestamp = new stream.Transform({
28+
transform(chunk, encoding, callback) {
29+
const line = getTimestamp() + ' ' + String(chunk);
30+
callback(null, line);
31+
},
32+
});
33+
34+
const [date] = new Date().toISOString().split('T');
35+
const log = fs.createWriteStream(`./${date}.log`);
36+
const stdout = stream.compose(addTimestamp, log);
37+
const stderr = stream.compose(shortenPath, stdout);
38+
39+
const console = new Console({ stdout, stderr });
40+
41+
try {
42+
console.log('Logging examle');
43+
console.table(Object.entries(log));
44+
const data = {};
45+
data.collUnknownMethod();
46+
} catch (error) {
47+
console.error(error);
48+
}

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