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Author: tshemsedinov

JavaScript/!!!!/2-functional-good.js

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+'use strict';
+
+// FP paradigm:
+// 1. Equations instead of control flow
+// 2. Lazy calculations
+// 3. Parallel execution ready
+// 4. Recursion instead of loops
+// 5. Immutability, no state
+// 6. No variables, no side effects
+// 7. Math model
+
+const fs = require('fs');
+
+const proportion = (max, val) => Math.round(val * 100 / max);
+const compose = (...funcs) => x => funcs.reduce((x, fn) => fn(x), x);
+
+const cellPad = (i, s, width) => (i ? s.padStart(width) : s.padEnd(width));
+const cellWidth = i => [18, 10, 8, 8, 18, 6][i];
+
+const renderCell = (cell, i) => cellPad(i, cell + '', cellWidth(i));
+const renderRow = row => row.map(renderCell).join('');
+const renderTable = table => table.map(renderRow).join('\n');
+
+const densityCol = () => 3
+const sortByDensity = table => table.sort(
+ (row1, row2) => (row2[densityCol()] - row1[densityCol()])
+)
+const calcColumn = (table, max) => table.map(
+ row => (row.push(proportion(max, row[densityCol()])), row)
+);
+const calcProportion = table => calcColumn(table, table[0][densityCol()]);
+
+const parseTable = lines => lines.map(line => line.split(','));
+const toLines = data => data.split('\n').filter((s, i) => i && s);
+const readFile = file => fs.readFileSync(file).toString();
+const getDataset = compose(readFile, toLines, parseTable);
+
+const main = compose(getDataset, sortByDensity, calcProportion, renderTable);
+
+console.log(main('./cities.dat'));

JavaScript/!!!!/4-oop.js

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+'use strict';
+
+const 

JavaScript/!!!!/5-functor.js

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+'use strict';
+
+const 

JavaScript/!!!!/6-asynchronous.js

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+'use strict';
+
+const 

JavaScript/!!!!/7-dsl.js

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+'use strict';
+
+const 

JavaScript/!!!!/8-event.js

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+'use strict';
+
+const 

JavaScript/!!!!/9-reactive.js

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+'use strict';
+
+const 

JavaScript/!!!!/a.js

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+const 人 = (α, β, γ) => (α + β + γ);
+const ツ = (α, γ) => 人(α, 10, γ);
+console.log(ツ(2, 3));
+
+const расстрелять = '🔫';
+console.log(расстрелять);

JavaScript/!!!!/compose.js

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+const compose = (...funcs) => x => funcs.reduce((x, fn) => fn(x), x);
+
+const inc = x => ++x;
+const square = x => x * x;
+const f = compose(inc, square);
+
+console.log(f(5));

JavaScript/!!!!/const.js

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+'use strict';
+
+con { ℕ, 𝕊 } = require('mathtypes');
+
+const util = require('util');
+
+const ℕ = (x) => {
+ if (typeof(x) !== 'number') {
+ throw new TypeError('Дыбилыбилять, это что, натуральное число?');
+ }
+ const ℕ = () => x;
+ const methods = {
+ is: value => value.name === 'ℕ',
+ get type() {
+ return ℕ.name;
+ },
+ [util.inspect.custom]: () => x
+ };
+ return Object.assign(ℕ, methods);
+};
+
+const 𝕊 = (x) => {
+ if (typeof(x) !== 'string') {
+ throw new TypeError('Дыбилыбилять, строка что такое, знаешь?');
+ }
+ const 𝕊 = () => x;
+ const methods = {
+ is: value => value.name === '𝕊',
+ get type() {
+ return 𝕊.name;
+ },
+ [util.inspect.custom]: () => x
+ };
+ return Object.assign(𝕊, methods);
+};
+
+const sum = (a, b) => ℕ(a) + ℕ(b);
+
+const a = ℕ(5);
+
+console.log('a.type === ' + a.type);
+
+const 人 = {
+ name: 𝕊('Marcus Aurelius'),
+ city: 𝕊('Rome'),
+ born: ℕ(121)
+};
+
+console.log({ 人 });
+console.log(人.name);
+console.log(人.name + ' from ' + 人.city);