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isMagicSquare.js
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isMagicSquare.js
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// A "magic square" is a square divided into smaller squares each containing a number, such that the numbers in each vertical,
// horizontal, and diagonal row add up to the same value.
// Examples:
// isMagicSquare([
// [8, 1, 6],
// [3, 5, 7],
// [4, 9, 2]
// ]) ➞ true
// isMagicSquare([
// [16, 3, 2, 13],
// [ 5, 10, 11, 8],
// [ 9, 6, 7, 12],
// [ 4, 15, 14, 1]
// ]) ➞ true
// isMagicSquare([
// [1, 2, 3],
// [4, 5, 6],
// [7, 8, 9]
// ]) ➞ false
// Notes:
// Check diagonals as well.
// Test input will always be square.
// Check the Resources tab for additional info on magic squares.
function isMagicSquare(square) {
const sum = (arr) => arr.reduce((a, c) => a + c, 0);
var rowSum = sum(square[0]);
// console.log(rowSum);
// console.log(square.length);
for (var i = 0; i < square.length; i++) {
if (sum(square[i]) != rowSum) {
return false;
}
// if (sum(square.map((row) => row[i])) != rowSum) {
// return false;
// }
}
return true;
}
console.log(
isMagicSquare([
[8, 1, 6],
[3, 5, 7],
[4, 9, 2],
])
);