important String Methods in javaScript (Cheat Sheet)

important String Methods in javaScript (Cheat Sheet)

javascript string methods/function: javascript replace, javascript contains, string length, javascript string concatenation, javascript string substring

Important String Methods in javaScript

  • Length Method
  • toLocaleLowerCase() Method
  • toLocaleLowerCase() Method
  • indexOf() Method
  • search() Method
  • slice() Method
  • substring() Method
  • substr() Method
  • replace() Method
  • includes() Method
  • concat() Method
  • charAt() Method
  • charCodeAt() Method
  • lastIndexOf() Method
  • trim() Method
  • match() Method
  • split() Method
  • toString() Method
  • valueOf() Method

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JavaScript String Methods You should know | JavaScript Tutorial

JavaScript String Methods You should know  | JavaScript Tutorial

In this javascript string methods tutorial. We will explain the most useful and important javascript string methods. Javascript string methods help to work with strings in javascript.

In this javascript string methods tutorial. We will explain the most useful and important javascript string methods. Javascript string methods help to work with strings in javascript.

We will demonstrate javascript string methods like javascript string replace, javascript string contains, javascript string length, javascript string concatenation, javascript string substring, remove the character from string javascript, javascript string uppercase, javascript string lowercase, string trim, tostring method, a match in the string, split string in javascript,
javascript string substr, trim string, array to comma-separated string, etc

We need to know some of the most important and useful javascript string methods.

Let’s see JavaScript String Methods

Important String Methods in javaScript

  • Length Method
  • toLocaleLowerCase() Method
  • toLocaleLowerCase() Method
  • indexOf() Method
  • search() Method
  • slice() Method
  • substring() Method
  • substr() Method
  • replace() Method
  • includes() Method
  • concat() Method
  • charAt() Method
  • charCodeAt() Method
  • lastIndexOf() Method
  • trim() Method
  • match() Method
  • split() Method
  • toString() Method
  • valueOf() Method

1. length() Method

It is used to count the number of characters in a string javascript.

Example

var str = "Hello Morioh";
var x = str.length;

Output

// return 
12

2. toLocaleLowerCase() Method

The javascript toLocaleLowerCase() is used to changed string into lower case.

Example

var str = "Hello Morioh";
var res = str.toLocaleLowerCase();

Output

// return
hello morioh

3. toLocaleUpperCase() Method

The javascript toLocaleUpperCase () is used to changed string into upper case.

Example

var str = "Hello Morioh";
var res = str.toLocaleUpperCase();

Output

// return
HELLO MORIOH

4. indexof() Method

The indexof () method returns the first position of a specified value in a string.

Example

var txt = "Connecting with Programmers and Developers all over the World";
 var test = txt.indexOf("over");

Output

// return 
47

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5. search() Method

The javascript search () method searches a string for the specified value, and returns the status of the match.

Example

var str = "Hello Morioh";
var res = str.search("Morioh");

Output

//Return
6

6. slice() Method

The slice () method removes the parts of a string and returns the extracted parts to a new string.

Use the Start and End Ultimate to specify the part of the string that you want to remove.

Example

var str = "JavaScript String Methods"; 
var res = str.slice(0, 10);

Output

// return
JavaScript

7. substring() Method

The Javascript substring() method is used to removes the characters from one string, between two specified indices, and returns the new substring.

Example

var str = "JavaScript String Methods"; 
var res =  str.substring(1, 4);

Output

//return
ava

8. substr() Method

A string substr() method begins on the character in the specified position, and returns the specified number of characters.

Example

var str = "JavaScript String Methods"; 
var res =  str.substr(1, 4);

Output

//return
avaS

9. replace() Method

The Javascript replace() changes the defined value to an another value:

Example

var str = "JavaScript String Methods"; 
var res = str.replace("Methods", "Tutorial");

Output

// return
JavaScript String Tutorial

10. includes() Method

The includes() method is used to determine whether a string contains the characters of a specified string or not. If is exist return true or not return false.

Example

var str = "Hello world, my name is morioh.";
var res = str.includes("name");

Output

// return 
True

11. concat() Method

The concat() method is used for join two or more strings.

Example

var str1 = "Hello ";
var str2 = "morioh!";
var res = str1.concat(str2);

Output

// return
Hello morioh!

12. charAt() Method

The Javascript charAt() is used to take a character to a described index location:

Example

var txt = "Hello Dev";
var res = txt.charAt(0);

Output

// return
H

13. charCodeAt() Method

The charCodeAt() method returns the Unicode of the character at a specified index in a string:

Example

var str = "TEST";
str.charCodeAt(0); 

Output

// return
84

14. lastIndexOf () Method

The lastIndexOf() the method returns the index of the last occurrence of a specified text in a string:

Example

var str = "Your are talented dev";
var pos = str.lastIndexOf("dev");

Output

// return
18

16. trim() Method

The javascript trim() method removes whitespace from both sides of a given string:

Example

var str = "        javascript trim() method removes whitespace        ";
alert(str.trim());

Output

// return
javascript trim() method removes whitespace

match() Method

The match() method searches a string for a match against a regular expression, and returns the matches, as an Array object.

Example

 var str = "lopersum lopersum lopersum lopersum."; 
 var res = str.match(/sum/g);

Output

// return
 sum,sum,sum,sum

17. split Method

The javascript split method, which is used to convert string to an array:

Example

var str = "1,2,3,4,5";
var arr = str.split(",");
document.write(arr[0]);
document.write("<br>");
document.write(arr[1]);
Output
// return
1
2

toString() Method

The javascript toString() method returns the value of a String object.

Example

var str = "javaScript World!";
var res = str.toString();

Output

// return
javaScript World!

18. valueOf() Method

The javascript valueOf() method, which is used to gets the primitive value of a String object.

Example

var str = "javaScript World!";
 var res = str.valueOf();

Output
// return
javaScript World!

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JavaScript | String indexOf() Method

JavaScript Strings | String concat() Method

JavaScript Strings | String concat() Method

JavaScript String concat() Method The concat() method is used to join two or more strings..we will explain the javascript string.concat() method with the definition of this method, syntax, parameters, and several examples.

In this tutorial, we will explain the javascript string.concat() method with the definition of this method, syntax, parameters, and several examples.

JavaScript String concat()

JavaScript concat() method, which is used to add or join or combine two or more strings together and it will return a new string.

Syntax

string.concat(string1, string2, string3, ...., stringX);

Parameters of string replace method

| Parameter | Description |
| string one, string two, string three, …, stringX | This is required. The strings to be combined or added |

Example:

Here we will take the first example of a javascript string concat() method. We have one string original string and we will add or join two more string in the original string using the concat() method.

var originalString = "JavaScript String, ";
var str1 = " Method The concat()";
var str2 = " Method is used to join two or more strings";
 
var res = originalString.concat(str1, str2);
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>JavaScript Strings | String concat() Method</title>
</head>
<body>
     
</body>
<script type = "text/javascript">
    var originalString = "JavaScript String, ";
    var str1 = " Method The concat()";
    var str2 = " Method is used to join two or more strings";

    var res = originalString.concat(str1, str2);

    document.write( "Output :- " + res ); 
</script>  

</html>

Result of the above code is:

Output :- JavaScript String, Method The concat() Method is used to join two or more strings

JavaScript | String indexOf() Method

JavaScript | String indexOf() Method

JavaScript: String indexOf() Method .javascript find occurrence of character in string. This tutorial explains to you how you can find the character in a given string using the javascript string indexOf() method.

javascript find occurrence of character in string. This tutorial explains to you how you can find the character in a given string using the javascript string indexOf() method.

In this tutorial, you also learn javascript find the occurrence of the character in the string.

JavaScript: String indexOf() Method

Definition:- The javascript string method indexOf(), which is used to find the first occurrence of a specified value in a given string.

Note:- This string method returns -1 if the value to search is not found in the given string.

Syntax:

The basic syntax of js string indexOf() method is:

str.indexOf( search_value, start)

Here,

  • Str:- It’s a given string
  • search_value:- This is a required parameter. String to search in a given string
  • start:- This is an optional parameter. Where to start the search in a given string

Ex1:

Let’s take first example of indexOf() method in javascript. Let you have one string like “Hello developers, welcome to the javascript tutorial.”. In this string, you want to find the first “de” character. Let’s see the below example:

var string = "Hello developers, welcome to the javascript tutorial.";
var res = string.indexOf("ve");
document.write('Result of the above code is:-' + res);

Result of the above code is:-8

Ex2:

Now we take a second example with a specific position. Let you have one string like above. And you want to find string or characters in a given string with a specific position. Let’s see the below-given example:

var string = "Hello javascript developers, welcome to the javascript tutorial.";
var res = string.indexOf("javascript", 10);
document.write('Result of the above code is:-' + res);

Result of the above code is:-44