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Check whether a number is a Fibonacci number or not JavaScript
We are required to write a JavaScript function that takes in a number and returns a boolean based on the fact whether or not it comes in the fibonacci series.
For example −
If the function call is like this −
fibonacci(12); fibonacci(89); fibonacci(55); fibonacci(534);
Then the output should be −
False true true false
Now, let’s write a recursive solution to this problem −
Example
const fibonacci = (query, count = 1, last = 0) => { if(count < query){ return fibonacci(query, count+last, count); }; if(count === query){ return true; } return false; }; console.log(fibonacci(12)); console.log(fibonacci(55)); console.log(fibonacci(89)); console.log(fibonacci(534));
Output
The output in the console will be −
false true true false
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