Maximum and minimum value

Goal: create a function minMax(arr) that returns an object with the minimum and maximum value from the array.

💡 Solution hint

Use built-in functions Math.min and Math.max
Or a single pass through the array, comparing element values

👀 Solution #1 (single pass)

/**
 * minMax(arr): returns an object with the minimum and maximum value of the array.
 * Examples:
 *   minMax([1, 2, 3]) -> { min: 1, max: 3 }
 *   minMax([-5, 0, 10]) -> { min: -5, max: 10 }
 * @param {number[]} arr — input array of numbers
 * @returns {{ min: number, max: number }}
 */
function minMax(arr) {
  let min = arr[0]; // Initialize minimum with first element
  let max = arr[0]; // Initialize maximum with first element
  
  // Iterate through the array starting from the second element
  for (let i = 1; i < arr.length; i++) {
    if (arr[i] < min) min = arr[i]; // Update minimum if necessary
    if (arr[i] > max) max = arr[i]; // Update maximum if necessary
  }
  
  return { min, max }; // Return result as an object
}

Why this approach:

Optimal in memory and time — only one pass through the array.

👀 Solution #2 (Math.min / Math.max)

function minMax(arr) {
  return {
    min: Math.min(...arr),
    max: Math.max(...arr)
  };
}

Why this approach:

Short and clear.
Uses standard JavaScript methods.
For large arrays (e.g., 100,000+ elements) may be slower than a loop.

👀 Solution #3 (reduce)

function minMax(arr) {
  return arr.reduce((acc, val) => {
    if (val < acc.min) acc.min = val;
    if (val > acc.max) acc.max = val;
    return acc;
  }, { min: arr[0], max: arr[0] });
}

Why this approach:

Functional style with reduce
Suitable if you prefer working with iterators.

Task Description

Write a function minMax that returns an object with the minimum and maximum value from the array.

Usage Examples

minMax([1, 2, 3]); // { min: 1, max: 3 }
minMax([-5, 0, 10]); // { min: -5, max: 10 }

Requirements

Function must be named minMax
Return an object with keys min and max
Work for any numbers, including negative ones
Do not modify the input array

Task Description

Usage Examples

Requirements

Maximum and minimum value

Task Description

Usage Examples

Requirements

🧑‍💻 It's not a bug! It's a feature!