DAY 7 (March 29, 2024) — Continuing with Common String Manipulation Questions

For those who want to practice coding while reading, we recommend using the online JavaScript Playground linked below. Enjoy coding!

Online JavaScript Playground:

Try experimenting with your code using this interactive platform.

Section 1.1: Checking if a String is Empty

Question 1: How can we determine if a string is empty?

Answer: It's important to understand the methods we use, such as the .trim() method, which eliminates whitespace from both ends of a string and returns a new string without altering the original.

function isEmptyString(str) {

return str.trim().length === 0;

}

console.log(isEmptyString("")); // true

console.log(isEmptyString("Hello")); // false

console.log(isEmptyString(" ")); // true (trimmed length is 0)

Without Trim Output:

function isEmptyString(str) {

return str.length === 0;

}

console.log(isEmptyString("")); // true

console.log(isEmptyString("Hello")); // false

console.log(isEmptyString(" ")); // false (no trimming)

Tip: Explore trimEnd() and trimStart() to see how they operate differently.

Section 1.2: Removing Whitespace Characters

Question 2: How do we eliminate all whitespace characters from a string?

Answer:

Method 1 — Using Regular Expressions:

const inputString = 'hello ntHow are you?';

console.log(inputString.replace(/s/g, ''));

Method 2 — Using Split and Join:

console.log(inputString.split(/s+/).join(''));

Section 1.3: Counting Vowels in a String

Question 3: How can we count the number of vowels in a given string?

Answer:

Method 1 — Simple For Loop:

const sentence = "my best world is my home only";

const vowels = ['a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'];

let count = 0;

for (let character of sentence) {

if (vowels.includes(character)) {

count++;

}

}

console.log(count);

Method 2 — Using Regular Expressions:

const vowelRegex = /[aeiou]/gi;

const matches = mybestword.match(vowelRegex);

const count = matches ? matches.length : 0;

console.log(count);

Section 1.4: Truncating a String

Question 4: How can we truncate a string if it's longer than a specified maximum length?

Answer:

const sentence = "my world is my home";

const maxLength = 10;

const truncated = sentence.length > maxLength ? sentence.slice(0, maxLength) + '..' : sentence;

console.log(truncated); // truncated string

Section 1.5: Removing Duplicate Words

Question 5: How can we eliminate duplicate words from sentences?

Answer: We invite all our coding friends to share their solutions in the comments!

We will continue our exploration with arrays and JavaScript data types in the upcoming week, from April 1st to April 7th, 2024.

Stay tuned for more, and happy coding! Remember, kindness is key—share knowledge to foster growth!

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