How To Find The Closest Value To Zero From An Array With Positive And ...

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On the last days, I needed to fill a codingame test that exposed the following problem that needed to be solved:

Chaud Codingame

In this exercise, you have to analyze records of temperature to find the closest to zero. Sample temperatures. Here, -1.7 is the closest to 0. Implement the function closestToZero to return the temperature closer to zero which belongs to the array ts.

  • If ts is empty, return 0 (zero).
  • If two numbers are as close to zero, consider the positive number as the closest to zero (eg. if ts contains -5 and 5, return 5).
Input:
  • Temperatures are always expressed with floating-point numbers ranging from -273 to 5526.
  • ts is always a valid array and is never null.

Solution

Based on the exposed data, the following implementation solves the problem:

/** * From a collection of numbers inside an array, returns the closest value to zero. */ function closestToZero(numbers) { if(!numbers.length){ return 0; } let closest = 0; for (let i = 0; i < numbers.length ; i++) { if (closest === 0) { closest = numbers[i]; } else if (numbers[i] > 0 && numbers[i] <= Math.abs(closest)) { closest = numbers[i]; } else if (numbers[i] < 0 && - numbers[i] < Math.abs(closest)) { closest = numbers[i]; } } return closest; }

You can test the code with different examples of your own:

let items = [7,-10, 13, 8, 4, -7.2,-12,-3.7,3.5,-9.6, 6.5,-1.7, -6.2,7]; // Result: -1.7 console.log("Result: " + closestToZero(items)); items = [5, 6, 7, 9 , 2, - 2]; // Result: 2 console.log("Result: " + closestToZero(items)); items = []; // Result: 0 console.log("Result: " + closestToZero(items));

Alternatively, one of the solutions of the community includes as well this other option:

function closestToZero(numbers) { if (numbers.length === 0) return 0; let closest = numbers[0]; for(let i = 0; i < numbers.length;i++){ let number = numbers[i]; let absNumber = Math.abs(number); let absClosest = Math.abs(closest); if (absNumber < absClosest) { closest = number; } else if (absNumber === absClosest && closest < 0) { closest = number; } } return closest; }

Happy coding ❤️!

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