JavaScript to check consecutive numbers in array?

Question

---

To check for consecutive numbers like 100, 101, 102, etc., use the concept of reduce(). TRUE would be returned for consecutive numbers, else false is the return value.

Example

const sequceIsConsecutive = (obj) =>
Boolean(obj.reduce((output, lastest) => (output ?
(Number(output.number) + 1=== Number(lastest.number) ? lastest : false)
: false)));
console.log("Is Consecutive="+sequceIsConsecutive ([{ number: '100'
},{number: '101'} ,{number: '102' }]));
console.log("Is Consecutive="+sequceIsConsecutive([{ number: '100' },
{number: '102'} ,{number: '104' }]));

To run the above program, you need to use the following command −

node fileName.js.

Here, my file name is demo126.js.

Output

This will produce the following output −

PS C:\Users\Amit\JavaScript-code> node demo126.js
Is Consecutive=true
Is Consecutive=false

AmitDiwan

Published on 10-Sep-2020 07:12:47