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Leaders array JavaScript
An element in an array of Numbers is a leader if it is greater than all the elements on its right side. We are required to write a JavaScript function that takes in an array of Numbers and returns a subarray of all the elements that are fulfil the criteria of being a leader element.
For example −
If the input array is: [23, 55, 2, 56, 3, 6, 7, 1] Then the output should be: [56, 7, 1]
Let's write the code for this function −
Example
const arr = [23, 55, 2, 56, 3, 6, 7, 1];
const leaderArray = arr => {
const creds = arr.reduceRight((acc, val) => {
let { max, res } = acc;
if(val > max){
res.unshift(val);
max = val;
};
return { max, res };
}, {
max: -Infinity,
res: []
})
return creds.res;
};
console.log(leaderArray(arr));Output
The output in the console will be −
[56, 7, 1]
Updated on: 31-Aug-2020
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