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Completed at: 2023-07-10T03:34:26.611Z
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Completed languages: javascript
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Tags: Arrays, Fundamentals
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Rank: 8 kyu
Your task is to find the first element of an array that is not consecutive.
By not consecutive we mean not exactly 1 larger than the previous element of the array.
E.g. If we have an array [1,2,3,4,6,7,8] then 1 then 2 then 3 then 4 are all consecutive but 6 is not, so that's the first non-consecutive number.
If a non consecutive number is found then return `true` and set the passed in pointer to the number found.
If the whole array is consecutive then return `false`.
If the whole array is consecutive then return `null`<sup>2</sup>.
The array will always have at least 2 elements1 and all elements will be numbers. The numbers will also all be unique and in ascending order. The numbers could be positive or negative and the first non-consecutive could be either too!
If you like this Kata, maybe try this one next: https://www.codewars.com/kata/represent-array-of-numbers-as-ranges
<sup>1</sup> Can you write a solution that will return `false` for both `[]` and `[ x ]` (an empty array and one with a single number) though? (This is an empty array and one with a single number and is not tested for, but you can write your own example test. )
<sup>1</sup> Can you write a solution that will return `null`<sup>2</sup> for both `[]` and `[ x ]` though? (This is an empty array and one with a single number and is not tested for, but you can write your own example test. )
<sup>2</sup>
Swift, Ruby and Crystal: `nil`
Haskell: `Nothing`
Python, Rust, Scala: `None`
Julia: `nothing`
Nim: `none(int)` (See [options](https://nim-lang.org/docs/options.html))