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VisualizaçõesUsing a 2D map in React to print a chessboard
I am pretty new to react but instead of using the common js for loop I am trying to figure out how to use the .map() to achieve the same result.
import React from 'react'
import './styles/Board.css'
import Tile from './Tile'
const Board = () => {
let board = []
printBoard(board)
return (
<div className="board">
{ board }
</div>
)
}
const printBoard = (board) => {
const boardY = [1, 2, 3, 4, 5, 6, 7, 8]
const boardX = ['a','b','c','d','e','f','g','h']
for(let x = 0; x < boardX.length; x++) {
for(let y = boardY.length - 1; y >= 0; --y) {
//saves the position in each square ex: b1
const pos = boardX[x] + "" + boardY[y]
//paints the squares and the positions
board.push(<Tile key={pos} color={ (x + y) % 2 === 0 ? "dark" : "light" } pos={pos} />)
}
}
}
export default Board
Current render
·
Juan Pablo Isaza
2 Respostas
Responde à pergunta0
You need to switch the loops (outer and inner) when doing the same with map function. And the y had to be replaced with (boardY.length - (yIndex + 1)) to get the decrementing index.
Try below
const Board = () => {
return <div className="board">{printBoard()}</div>;
};
const printBoard = () => {
const boardY = [1, 2, 3, 4, 5, 6, 7, 8];
const boardX = ["a", "b", "c", "d", "e", "f", "g", "h"];
const boardYRevered = boardY.reverse();
return boardYRevered.flatMap((y, yIndex) => {
return boardX.map((x, xIndex) => {
const pos = `${x}${y}`;
return (
<Tile
key={pos}
color={
(xIndex + (boardY.length - (yIndex + 1))) % 2 === 0
? "dark"
: "light"
}
pos={pos}
/>
);
});
});
};
NOTE: If you want a 2D array of the chessboard, change flatMap to map.
·
Juan Pablo Isaza
Relatório
0
import React from "react";
const Board = () => {
const boardY = [1, 2, 3, 4, 5, 6, 7, 8];
const boardX = ["a", "b", "c", "d", "e", "f", "g", "h"];
const reverseY = boardY.reverse();
return (
<div className="board">
{boardX.map((xValues,indexX) =>
reverseY.map((yValues, indexY) => {
const pos = xValues + "" + yValues;
const colorIndex = indexX + indexY;
<Tile key={pos} color={ colorIndex % 2 === 0 ? "dark" : "light" } pos={pos} />
})
)}
</div>
);
};
export default Board;
·
Juan Pablo Isaza
Relatório
Responde à pergunta