# Finding the continuity of two arrays in JavaScript

We are required to write a JavaScript function that takes in two arrays of numbers. And the function should return true if the two arrays upon combining and shuffling can form a consecutive sequence, false otherwise.

For example: If the arrays are −

const arr1 = [4, 6, 2, 9, 3];
const arr2 = [1, 5, 8, 7];

Then the output should be true.

Therefore, let’s write the code for this function −

## Example

The code for this will be −

const arr1 = [4, 6, 2, 9, 3];
const arr2 = [1, 5, 8, 7];
const canFormSequence = (arr1, arr2) => {
const combined = [...arr1, ...arr2];
if(combined.length < 2){
return true;
};
combined.sort((a, b) => a-b);
const commonDifference = combined[0] - combined[1];
for(let i = 1; i < combined.length-1; i++){
if(combined[i] - combined[i+1] === commonDifference){
continue;
};
return false;
};
return true;
};
console.log(canFormSequence(arr1, arr2));

## Output

The output in the console will be −

true

Updated on: 19-Oct-2020

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