new class js -advanced

02_advanced/MATERIAL/advanced-js/lesson_04/examples/chess.js

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+'use strict';
+
+const board2string = (board) => board.map((row) => row.join('')).join('\n');
+
+const execMove = (board, move) => {
+  const originX = fieldToXPosition(originField(move));
+  const originY = fieldToYPosition(originField(move));
+  const targetX = fieldToXPosition(targetField(move));
+  const targetY = fieldToYPosition(targetField(move));
+
+  board[targetY][targetX] = board[originY][originX];
+  board[originY][originX] = emptyBoard()[originY][originX];
+  return board;
+};
+
+const boardInStartPosition = () => [
+  ['♜', '♞', '♝', '♛', '♚', '♝', '♞', '♜'],
+  ['♟', '♟', '♟', '♟', '♟', '♟', '♟', '♟'],
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+  ['♙', '♙', '♙', '♙', '♙', '♙', '♙', '♙'],
+  ['♖', '♘', '♗', '♕', '♔', '♗', '♘', '♖'],
+];
+
+const emptyBoard = () => [
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+];
+
+const originField = (move) => move.substr(0, 2);
+const targetField = (move) => move.substr(2);
+
+const fieldToXPosition = (field) => letterToChessIndex(field.charAt(0));
+const fieldToYPosition = (field) => numberToChessIndex(field.charAt(1));
+const letterToChessIndex = (letter) => 'abcdefgh'.indexOf(letter);
+const numberToChessIndex = (num) => 8 - num;
+
+console.log(board2string(boardInStartPosition()));
+
+console.log('\n');
+
+console.log(board2string(execMove(boardInStartPosition(), 'e2e4')));

02_advanced/MATERIAL/advanced-js/lesson_04/examples/chess_exec.js

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+'use strict';
+
+const board2string = (board) => board.map((row) => row.join('')).join('\n');
+
+const execMoves = (moves) => moves.reduce(execMove, boardInStartPosition());
+
+const execMove = (board, move) => {
+  const originX = fieldToXPosition(originField(move));
+  const originY = fieldToYPosition(originField(move));
+  const targetX = fieldToXPosition(targetField(move));
+  const targetY = fieldToYPosition(targetField(move));
+
+  board[targetY][targetX] = board[originY][originX];
+  board[originY][originX] = emptyBoard()[originY][originX];
+  return board;
+};
+
+const boardInStartPosition = () => [
+  ['♜', '♞', '♝', '♛', '♚', '♝', '♞', '♜'],
+  ['♟', '♟', '♟', '♟', '♟', '♟', '♟', '♟'],
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+  ['♙', '♙', '♙', '♙', '♙', '♙', '♙', '♙'],
+  ['♖', '♘', '♗', '♕', '♔', '♗', '♘', '♖'],
+];
+
+const emptyBoard = () => [
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+];
+
+const originField = (move) => move.substr(0, 2);
+const targetField = (move) => move.substr(2);
+
+const fieldToXPosition = (field) => letterToChessIndex(field.charAt(0));
+const fieldToYPosition = (field) => numberToChessIndex(field.charAt(1));
+const letterToChessIndex = (letter) => 'abcdefgh'.indexOf(letter);
+const numberToChessIndex = (num) => 8 - num;
+
+console.log(board2string(boardInStartPosition()));
+
+console.log('\n');
+
+console.log(board2string(execMove(boardInStartPosition(), 'e2e4')));
+
+console.log('\n');
+
+console.log(board2string(execMoves(['e2e4', 'e7e5', 'f2f4'])));

02_advanced/MATERIAL/advanced-js/lesson_04/examples/chess_final.js

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+'use strict';
+
+const board2string = (board) => board.map((row) => row.join('')).join('\n');
+
+const positionHistoryForMoves = (moves) =>
+  moves.map((move, i) => moves.slice(0, i + 1)).map(execMoves);
+
+const execMoves = (moves) => moves.reduce(execMove, boardInStartPosition());
+
+const execMove = (board, move) => {
+  const originX = fieldToXPosition(originField(move));
+  const originY = fieldToYPosition(originField(move));
+  const targetX = fieldToXPosition(targetField(move));
+  const targetY = fieldToYPosition(targetField(move));
+
+  board[targetY][targetX] = board[originY][originX];
+  board[originY][originX] = emptyBoard()[originY][originX];
+  return board;
+};
+
+const boardInStartPosition = () => [
+  ['♜', '♞', '♝', '♛', '♚', '♝', '♞', '♜'],
+  ['♟', '♟', '♟', '♟', '♟', '♟', '♟', '♟'],
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+  ['♙', '♙', '♙', '♙', '♙', '♙', '♙', '♙'],
+  ['♖', '♘', '♗', '♕', '♔', '♗', '♘', '♖'],
+];
+
+const emptyBoard = () => [
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+  ['◻', '▦', '◻', '▦', '◻', '▦', '◻', '▦'],
+  ['▦', '◻', '▦', '◻', '▦', '◻', '▦', '◻'],
+];
+
+const originField = (move) => move.substr(0, 2);
+const targetField = (move) => move.substr(2);
+
+const fieldToXPosition = (field) => letterToChessIndex(field.charAt(0));
+const fieldToYPosition = (field) => numberToChessIndex(field.charAt(1));
+const letterToChessIndex = (letter) => 'abcdefgh'.indexOf(letter);
+const numberToChessIndex = (num) => 8 - num;
+
+const history = positionHistoryForMoves(['e2e4', 'e7e5', 'f2f4']);
+
+console.log(history);
+
+history.forEach((position) => console.log(board2string(position), '\n'));

02_advanced/MATERIAL/advanced-js/lesson_04/examples/grades_table.js

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+const gradesTable = [
+  ['Name', 'Mathematics', 'English', 'Biology'],
+  ['Anna', 85, 92, 78],
+  ['Ben', 90, 88, 84],
+  ['Clara', 76, 95, 89],
+];
+
+// Change Anna's math grade to 88
+gradesTable[1][1] = 88;
+
+// Add a new row for another student
+gradesTable.push(['David', 82, 79, 91]);
+
+console.log(gradesTable);

02_advanced/MATERIAL/advanced-js/lesson_04/examples/inventory.js

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+'use strict';
+
+const inventory = [
+  [
+    // Category: Electronics
+    ['Shelf 1', 'Laptop', 10],
+    ['Shelf 2', 'Smartphone', 25],
+  ],
+  [
+    // Category: Clothing
+    ['Shelf 1', 'T-Shirts', 50],
+    ['Shelf 2', 'Jeans', 30],
+  ],
+  [
+    // Category: Groceries
+    ['Shelf 1', 'Milk', 100],
+    ['Shelf 2', 'Bread', 80],
+  ],
+];
+
+// Increase the number of laptops
+inventory[0][0][2] += 5; // New quantity: 15
+
+// Add a new shelf to a category
+inventory[1].push(['Shelf 3', 'Pants', 20]);
+
+console.log(inventory);