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@anthonny

anthonny/snail.js

Last active Mar 29, 2019
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snail = function(array) {
if (!array || array.length && !array[0].length) {
return [];
}
const start = 0, nbCols = array[0].length, nbRows = array.length;
return parse(array, start, nbCols, 0, nbRows);
}
function parse(array, start, nbCols, row, nbRows) {
const results = [];
for (let i = start; i < start + nbCols; i ++) {
results.push(array[row][i])
}
if (nbCols == 1) return results;
for (let i = row + 1; i < row + nbRows; i ++) {
results.push(array[i][start + nbCols - 1])
}
for (let i = nbCols + start - 2; i >= start; i --) {
results.push(array[row + nbRows - 1][i])
}
for (let i = nbRows + row - 2; i > row; i --) {
results.push(array[i][start])
}
if (row === Math.floor(array.length / 2) + 1) return results;
return results.concat(parse(array, start + 1, nbCols - 2, row + 1, nbRows - 2))
}
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