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JavaScript: Convert Binary to Decimal using recursion

JavaScript Function: Exercise-11 with Solution

Write a JavaScript program to convert Binary number (positive) to Decimal using recursion.

Test Data:
(1) -> "1"
(0) -> "0"
(10) -> "1010"
(101) -> "1100101"

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Convert Binary to Decimal using recursion</title>
</head>
<body>

</body>
</html>

JavaScript Code:

const test = (n) => {
  if (n === 0 || n === 1) 
  {
    return String(n)
  }
  return test(Math.floor(n / 2)) + String(n % 2)
}
console.log(test(1))
console.log(test(0))
console.log(test(10))
console.log(test(101))

Output:

1
0
1010
1100101

Flowchart:

Flowchart: JavaScript recursion function- Convert Binary to Decimal using recursion.

Live Demo:

See the Pen javascript-recursion-function-exercise-11 by w3resource (@w3resource) on CodePen.


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Next:Binary Search Algorithm using recursion.

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JavaScript: Tips of the Day

function and arguments

const person = {
  name: 'Lydia Hallie',
  hobbies: ['coding'],
};

function addHobby(hobby, hobbies = person.hobbies) {
  hobbies.push(hobby);
  return hobbies;
}

addHobby('running', []);
addHobby('dancing');
addHobby('baking', person.hobbies);

console.log(person.hobbies);

The addHobby function receives two arguments, hobby and hobbies with the default value of the hobbies array on the person object.
First, we invoke the addHobby function, and pass "running" as the value for hobby and an empty array as the value for hobbies. Since we pass an empty array as the value for y, "running" gets added to this empty array.
Then, we invoke the addHobby function, and pass "dancing" as the value for hobby. We didn't pass a value for hobbies, so it gets the default value, the hobbies property on the person object. We push the hobby dancing to the person.hobbies array.
Last, we invoke the addHobby function, and pass "bdaking" as the value for hobby, and the person.hobbies array as the value for hobbies. We push the hobby baking to the person.hobbies array.
After pushing dancing and baking, the value of person.hobbies is ["coding", "dancing", "baking"]

Ref: https://bit.ly/2Hcpkm6