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Finding a greatest number in a nested array in JavaScript
We have to write a simple function in JavaScript that takes in an array of Numbers (nested to any level) and return the greatest number present in the array.
For example − If the input array is −
const arr = [ 34, 65, 67, [ 43, 76, 87, 23, 56, 7, [ 54, 7, 87, 23, 79, 314, 2 ], 54 ], 54, 4, 2 ];
Then the output should be −
314
We will use recursion to find the greatest number in the array. Let’s write the code for it
Example
const arr = [ 34, 65, 67, [ 43, 76, 87, 23, 56, 7, [ 54, 7, 87, 23, 79, 314, 2 ], 54 ], 54, 4, 2 ]; const findGreatest = (arr, greatest = -Infinity) => { for(let i = 0; i < arr.length; i++){ if(Array.isArray(arr[i])){ return findGreatest(arr[i], greatest); }; if(arr[i] > greatest){ greatest = arr[i]; } }; return greatest; }; console.log(findGreatest(arr));
Output
The output in the console will be −
314
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