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JavaScript - Turn on the kth bit of a given number

JavaScript Bit Manipulation: Exercise-10 with Solution

Write a JavaScript program to turn on the kth bit in a given number. Return the new number.

Test Data:
(33, 3)-> 37

Explanation:
Binary format of 33 is -> 100001
Fortmat of the said number after on the 3rd bit -> 100101
After converting 100101 to decimal : 100101 -> 37
(101, 5) -> 117
Explanation:
Binary format of 100 is -> 1100101
Fortmat of the said number after on the 5th bit -> 1110101
After converting 1110101 to decimal : 1110101 -> 117

Sample Solution:

JavaScript Code:

const turn_On_Kth_Bit = (n, k) => {
 if (typeof n!= "number") {
     return 'It must be number!'
     }
   return n | (1 << (k - 1));
 }
n = 33
k = 3
console.log(n + " in binary is " + n.toString(2))
console.log("Turning k'th bit on,"+" k = "+k);
result_n = turn_On_Kth_Bit(n, k);
console.log(result_n + " in binary is " + result_n.toString(2))

n = 101
k = 5
console.log(n + " in binary is " + n.toString(2))
console.log("Turning k'th bit on,"+" k = "+k);
result_n = turn_On_Kth_Bit(n, k);
console.log(result_n + " in binary is " + result_n.toString(2))

Sample Output:

33 in binary is 100001
Turning k'th bit on, k = 3
37 in binary is 100101
101 in binary is 1100101
Turning k'th bit on, k = 5
117 in binary is 1110101

Flowchart:

Flowchart: JavaScript - Turn on the  kth bit of  a given number.

Live Demo:

See the Pen javascript-bit-manipulation-exercise-10 by w3resource (@w3resource) on CodePen.


* To run the code mouse over on Result panel and click on 'RERUN' button.*

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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