These are some most Important String Methods and their examples:

1. length() :  The length method returns the length of a string.

Example:

let txt = 'codingtorque';
let length = txt.length;
console.log(length)

Output:

Output => 12

2. slice(start, end) : slice() extract a part of a string and returns the extracted part in a new string.

Example:

let str = 'codingtorque';
let strSlice = str.slice(0, 6)
console.log(strSlice)

Output:

Output => coding

3. substring(start, end) : substring() is similar to slice() function. The difference is substring cannot accept negative indexes.

Example:

let txt = 'codingtorque';
let length = txt.substring(0, 6);
console.log(length)

Output:

// Output => coding

4. substr(start, length) : substr() is similar to slice(). The difference is, the second parameter specifies the length.

Example:

let str = 'Welcome to @code.scientist';
let replacedStr = str.replace('@code.scientist', '@codingtorque')
console.log(replacedStr)

Output:

Output => Welcome to @codingtorque

5. toUppercase() : toUppercase() simply converts a string into uppercase.

Example:

let str = 'coding torque';
let uppercase = str.toUpperCase() // Converted to uppercase
console.log(uppercase)

Output:

Output => CODING TORQUE

6. toLowercase() : toLowercase() simply converts a string into lowercase.

Example:

let str = 'CodinG Torque';
let lowercase = str.toLowerCase() // Converted to uppercase
console.log(lowercase)

Output:

Output => coding torque

7. concat() : concat() joins two or more strings. For example, if you want to join your first name and last name, you can use concat method to join.

Example:

let text1 = 'Coding';
let text2 = 'Torque';
let combined = text1.concat(' ', text2) // Combined text1 & text2
console.log(combined)

Output:

Output => Coding Torque

8. trim() : trim() method remove whitespaces from both side of a string. For example, if you are copying a text from another websites, there might be an unnecessary white spaces which you want to remove. You can use trim function to remove them.

Example:

let str = '    Coding Torque        ';
let trimed = str.trim() // Trimmed Text
console.log(trimed)

Output:

Output => Coding Torque

9. replace() : replace() method replace a specified value with another value in a string and return extracted part.

Example:

let str = 'Welcome to @code.scientist';
let replacedStr = str.replace('@code.scientist', '@codingtorque')
console.log(replacedStr)

Output:

Output => Welcome to @codingtorque

10. split() : A string can be converted into an array using split() method.

Example:

let str = 'Coding Torque';
let splitted = str.split(' ') // Splitted Text in Array
console.log(splitted)

Output:

Output => ['Coding', 'Torque']