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Finding the maximum in a nested array - JavaScript
Let’s say, we have to write a simple function in JavaScript that takes in the following array of Numbers (nested to any level) −
const arr = [ 15, 24, [ 29, 85, 56, [ 36, 14, 6, 98, 34, 52 ], 22 ], 87, 60 ];
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, 994, 2 ], 54 ], 54, 4, 2 ];
Then the output should be −
994
We will use recursion to find the greatest number in the array,
Example
Following is the code −
const arr = [ 34, 65, 67, [ 43, 76, 87, 23, 56, 7, [ 54, 7, 87, 23, 79, 994, 2 ], 54 ], 54, 4, 2 ]; const getGreatest = (arr, greatest = -Infinity) => { for(let i = 0; i < arr.length; i++){ if(Array.isArray(arr[i])){ return getGreatest(arr[i], greatest); }; if(arr[i] > greatest){ greatest = arr[i]; } }; return greatest; }; console.log(getGreatest(arr));
Output
This will produce the following output in console −
994
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