problem: 0006. Zigzag Conversion

src/0006/README.md

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+# 0006. [Zigzag Conversion](https://leetcode.com/problems/zigzag-conversion/description/?envType=study-plan-v2&envId=top-interview-150)
+
+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)
+
+<pre><code>
+P   A   H   N
+A P L S I I G
+Y   I   R
+<code></pre>
+
+And then read line by line: `"PAHNAPLSIIGYIR"`
+
+Write the code that will take a string and make this conversion given a number of rows:
+
+<pre><code>string convert(string s, int numRows);</code></pre>
+
+### **Example 1:**
+
+<pre><code>
+<strong>Input:</strong> s = "PAYPALISHIRING", numRows = 3
+<strong>Output:</strong> "PAHNAPLSIIGYIR"
+</code></pre>
+
+### **Example 2:**
+
+<pre><code>
+<strong>Input:</strong> s = "PAYPALISHIRING", numRows = 4
+<strong>Output:</strong> "PINALSIGYAHRPI"
+<strong>Explanation:</strong>
+P     I    N
+A   L S  I G
+Y A   H R
+P     I
+</code></pre>
+
+### **Example 3:**
+
+<pre><code>
+<strong>Input:</strong> s = "A", numRows = 1
+<strong>Output:</strong> "A"
+</code></pre>
+
+### **Constraints:**
+
+- `1 <= s.length <= 1000`
+- `s` consists of English letters (lower-case and upper-case), `','` and `'.'`.
+- `1 <= numRows <= 1000`

src/0006/index.test.ts

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+import { convert } from '.';
+
+describe('0006. Zigzag Conversion', () => {
+  interface TestCase {
+    input: {
+      s: string;
+      numRows: number;
+    };
+    expected: string;
+  }
+
+  const testCases: TestCase[] = [
+    {
+      input: {
+        s: 'PAYPALISHIRING',
+        numRows: 3,
+      },
+      expected: 'PAHNAPLSIIGYIR',
+    },
+    {
+      input: {
+        s: 'PAYPALISHIRING',
+        numRows: 4,
+      },
+      expected: 'PINALSIGYAHRPI',
+    },
+    {
+      input: {
+        s: 'A',
+        numRows: 1,
+      },
+      expected: 'A',
+    },
+  ];
+
+  test.each(testCases)('Case %#', ({ input: { s, numRows }, expected }) => {
+    const result = convert(s, numRows);
+    expect(result).toBe(expected);
+  });
+});

src/0006/index.ts

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+function convert(s: string, numRows: number): string {}
+
+export { convert };