Strings

String #

The String global object is a constructor for strings.
It uses literal notation.

" Stirng text "

' Stirng text2 '

` String text3 `

String.prototype.indexOf() #

The indexOf() method returns the first index at which a given value can be found in the String object on which it was called. It returns -1 if the value is not found.

String.prototype.slice() #

The slice() method extracts a section of a string and returns a new string.

slice(0,3): Extracts from index 0 up to (but not including) index 3 > extracts 0, 1, 2

replace() #

The replace() method is called as replace('string 1', 'string 2');. This can be interpreted as replacing 'string 1' with 'string 2'.

trim() #

The trim() method removes whitespace from the beginning of a string.

indexOf

const result = 'Hello World'.indexOf('World');
console.log(result) // 6 found starting at index 6

result = 'Hello World'.indexOf('huemang');
console.log(result) // -1 no matching value

//String.prototype.indexOf()
// If no value is provided to indexOf, `undefined` is used as the search string

slice()

const str1 = "hello world";
console.log(str.slice(0,3)); // hel

replace()

const str ="hello world!";

console.log(str.replace('world','huemang')); // `replace()` replaces the content corresponding to the first argument with the content corresponding to the second argument.

// If you want to 'delete' with replace, you can provide an empty string `''` as the second argument.
console.log(str.replace('world','')); // hello

tirm()

const str = '    Hello world  '
console.log(str.trim()); // Removes all leading whitespace characters from the string