Find Maximum Occurring Character

What you’ll build / What this tests

This premium javascript coding focuses on Find Maximum Occurring Character. You’ll apply strings and frequency thinking with easy level constraints. The prompt emphasizes Find the most frequent character in a string using a frequency map. Track counts in one….

Learning goals

• Translate the prompt into a clear javascript API signature and return shape.
• Apply strings, frequency, hash-map techniques to implement find maximum occurring character.
• Handle easy edge cases without sacrificing readability.
• Reason about time/space complexity and trade-offs in javascript.

Key decisions to discuss

• Define the exact input/output contract before coding.
• Prioritize predictable edge-case handling over micro-optimizations.

Evaluation rubric

• Correctness: covers required behaviors and edge cases.
• Clarity: readable structure and predictable control flow.
• Complexity: avoids unnecessary work for large inputs.
• API discipline: no mutation of inputs; returns expected shape.
• Testability: solution is easy to unit test.

Constraints / Requirements

• Handle empty strings and mixed casing without errors.
• Avoid prototype pitfalls when reading object keys.
• Handle empty or missing inputs without throwing errors.
• Keep runtime close to linear time where possible.
• Prefer a pure function: no side effects beyond the return value.

Mini snippet (usage only)

// Example usage
const str = /* find maximum occurring character input */;
const result = maxChar(str);
console.log(result);

// Edge case check
const empty = str ?? null;
const fallback = maxChar(str);
console.log(fallback);

// Expected: describe output shape, not the implementation
// (no solution code in preview)

Common pitfalls

• Mutating inputs instead of returning a new value.
• Skipping edge cases like empty input, duplicates, or nulls.
• Overlooking time complexity for large inputs.

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