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Zigzag_Conversion.js
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Zigzag_Conversion.js
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/* description :
The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)
P A H N
A P L S I I G
Y I R
And then read line by line: "PAHNAPLSIIGYIR"
Write the code that will take a string and make this conversion given a number of rows:
string convert(string s, int numRows);
Example 1:
Input: s = "PAYPALISHIRING", numRows = 3
Output: "PAHNAPLSIIGYIR"
Example 2:
Input: s = "PAYPALISHIRING", numRows = 4
Output: "PINALSIGYAHRPI"
Explanation:
P I N
A L S I G
Y A H R
P I
Example 3:
Input: s = "A", numRows = 1
Output: "A"
Constraints:
1 <= s.length <= 1000
s consists of English letters (lower-case and upper-case), ',' and '.'.
1 <= numRows <= 1000 */
// ==========================================================================================================
const convert = (s, numRows) => {
if (numRows === 1 || numRows >= s.length) {
return s;
}
const result = Array.from({ length: numRows }, () => '');
let index = 0, step = 1;
for (const char of s) {
result[index] += char;
if (index === 0) {
step = 1;
} else if (index === numRows - 1) {
step = -1;
}
index += step;
}
return result.join('');
}
console.log('result', convert('PAYPALISHIRING' , 1))