In my JavaScript code for generating a Fibonacci series, I aim to include a comma at the end of each string

Question

In my JavaScript code for generating a Fibonacci series, I aim to include a comma at the end of each string

I am currently working on a JavaScript program to generate a Fibonacci series, and there are certain conditions that need to be met:

Each number in the series should be separated by a comma.
The method should handle invalid values and return -1 for integers less than 1 or non-numeric values.
The returned value must always be a string for valid input.
The output string should always end with a comma.

So far, I have completed the first three steps successfully. However, I am facing a challenge when it comes to adding a comma at the end of the series. I am struggling to understand how to achieve this without causing issues such as missing commas between numbers along the way.

function fibonacci(len) {
  var a = 0,
    b = 1,
    f = 1,
    sum = 1;
  if (len > 2) {
    for (var i = 2; i <= len; i++) {
      f = a + b;
      sum += ',' + f;
      a = b;
      b = f;
    }
  } else if (len == 1) {
    sum = '1,1,';
  } else {
    sum = '-1';
  }
  return sum;
}
console.log(fibonacci(10))

javascript

Answer 1

Answer №1

function generateFibonacciSequence(length) {
    // validate the length parameter
    if(isNaN(length) || (parseInt(length) | 0) !== length || length < 1) {
        return -1;
    }
    
    var sequence = [1, 1];
    
    for(let index = 1; index<length; index++) {
        // calculate next fibonacci number
        var nextNumber = sequence[index] + sequence[index-1];
        sequence.push(nextNumber);
    }
    
    // convert array to a comma-separated string
    return sequence.join(", ") + ",";
}

console.log(generateFibonacciSequence(1))
console.log(generateFibonacciSequence(5))
console.log(generateFibonacciSequence("a"))

Answer 2

function generateFibonacciSequence(length) {
    // validate the length parameter
    if(isNaN(length) || (parseInt(length) | 0) !== length || length < 1) {
        return -1;
    }
    
    var sequence = [1, 1];
    
    for(let index = 1; index<length; index++) {
        // calculate next fibonacci number
        var nextNumber = sequence[index] + sequence[index-1];
        sequence.push(nextNumber);
    }
    
    // convert array to a comma-separated string
    return sequence.join(", ") + ",";
}

console.log(generateFibonacciSequence(1))
console.log(generateFibonacciSequence(5))
console.log(generateFibonacciSequence("a"))

Answer 3

Answer №2

Here's a quick solution: return sum+",";

I recommend using an array and the join method to streamline your code. Don't forget to remove any unnecessary data at the beginning.

Additionally, start looping from 1 instead of 0.

function fibonacci(len) {
  if (isNaN(len) || len < 1 ) return -1;
  let a = 0, b = 1, f = 1, sum = [1];
  for (let i = 1; i <= len; i++) {
    f = a + b;
    sum.push(f);
    a = b;
    b = f;
  }
  return sum === -1 ? sum : sum.join(",") + ",";
}

// tests
console.log(fibonacci(10))
console.log(fibonacci(1))
console.log(fibonacci(2))
console.log(fibonacci(0))
console.log(fibonacci("A"))
console.log(fibonacci("    1    "))

Answer 4

Here's a quick solution: return sum+",";

I recommend using an array and the join method to streamline your code. Don't forget to remove any unnecessary data at the beginning.

Additionally, start looping from 1 instead of 0.

function fibonacci(len) {
  if (isNaN(len) || len < 1 ) return -1;
  let a = 0, b = 1, f = 1, sum = [1];
  for (let i = 1; i <= len; i++) {
    f = a + b;
    sum.push(f);
    a = b;
    b = f;
  }
  return sum === -1 ? sum : sum.join(",") + ",";
}

// tests
console.log(fibonacci(10))
console.log(fibonacci(1))
console.log(fibonacci(2))
console.log(fibonacci(0))
console.log(fibonacci("A"))
console.log(fibonacci("    1    "))

In my JavaScript code for generating a Fibonacci series, I aim to include a comma at the end of each string

Answer №1

Answer №2

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