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JavaScript: Check a string is in Flat case

JavaScript String: Exercise-53 with Solution

Flat case: As the name implies, flatcase refers to the use of lowercase letters, with no spaces between words.
Write a JavaScript function to check a given string is in Flat case or not.
Test Data:
('j') -> true
('java exercises') -> false
('JavaScriptExercises') -> false
('javascriptexercises') -> true
(12356) -> "It must be a string."

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript function to Check a string is in Flat case</title>
</head>
<body>

</body>
</html>

JavaScript Code:

const test = (text) => {
  if (typeof text !== 'string') {
    return 'It must be a string.'
  }
  const pattern = /^[a-z]*$/
  return pattern.test(text)
}
console.log(test('j'))
console.log(test('java exercises'))
console.log(test('JavaScriptExercises'))
console.log(test('javascriptexercises'))
console.log(test(12356))

Sample Output:

true
false
false
true
It must be a string.

Flowchart:

Flowchart: JavaScript: Check a string is in Flat case

Live Demo:

See the Pen javascript-string-exercise-53 by w3resource (@w3resource) on CodePen.


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Next: Check a string is in Kebab case.

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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