String methods in javascript

In this article, I am writing about the basic string methods in javascript

What are strings?

JavaScript strings are for storing and manipulating text. Now we will learn about the JavaScript string methods.

• Length

  The length of a string in JavaScript can be found using the .length property. Since .length is a property it must be called through an instance of a string class.

  Syntax

  The syntax to use the length method is as follows:

  string.length
  

  Example code

  const string = "Javascript is great"
  console.log(string.length)
  

  The above code snippet returns the following:

  19
  

• Trim

  Trim is used in removing the white space at the beginning and at the end without modifying the original string.

  Syntax

  The syntax to use the trim method is as follows:

  string.trim()
  

  Example code

  const string = " Javascript is great "
  console.log(string.trim())
  

  The above code snippet returns the following:

  Javascript is great
  

  Let's see what happens when we add .length to it

  console.log(string.trim().length)
  

  The above code snippet returns the following:

  19
  

• Split

  The split() method splits a string into an array of substrings.

  Syntax

  The syntax to use the split method is as follows:

  string.split(" ")
  

  Example code

  const string = "Javascript is great"
  const arr = string.split(" ")
  console.log(arr)
  

  The above code snippet returns the following:

  [ 'Javascript', 'is', 'great' ]
  

• Includes

  The includes() method returns true if a string contains a specified string. Otherwise, it returns false. The includes() method is case sensitive.

  Syntax

  The syntax to use the includes method is as follows:

  string.includes("value")
  

  Example code

  const string = "Javascript is great"
  if(string.includes("great")){
  console.log('true')
  }else{
  console.log('false')
  }
  

  The above code snippet returns the following:

  true
  

  Example code

  const string = "Javascript is great"
  if(string.includes("hi")){
  console.log('true')
  }else{
  console.log('false')
  }
  

  The above code snippet returns the following:

  false
  

• Char At

  The charAt() method returns the character at a specified index (position) in a string. The index of the first character is 0.

  Syntax

  The syntax to use the Char At method is as follows:

  string.charAt(index)
  

  Example code

  const string = "Javascript is great"
  const myChar = string.charAt(5)
  console.log(myChar)
  

  The above code snippet returns the following:

  c
  

• Slice

  The slice() method extracts a part of a string. The start and end parameters specify the part of the string to extract.

  Syntax

  The syntax to use the slice method is as follows:

  string.slice(start, end)
  

  Example code

  const string = "Javascript is great"
  const char = string.slice(2,6)
  console.log(char)
  

  The above code snippet returns the following:

  vasc
  

• To Lower Case

  The toLowerCase() method converts a string to lowercase letters.

  Syntax

  The syntax to use this method is as follows:

  string.toLowerCase()
  

  Example code

  const string = "JAVASCRIPT IS GREAT"
  console.log(string.toLowerCase())
  

  The above code snippet returns the following:

  javascript is great
  

• To Upper Case

  The toUpperCase() method converts a string to uppercase letters.

  Syntax

  The syntax to use this method is as follows:

  string.toUpperCase()
  

  Example code

  const string = "javascript is great"
  console.log(string.toUpperCase())
  

  The above code snippet returns the following:

  JAVASCRIPT IS GREAT
  

• Replace

  The replace() method searches a string for a value or a regular expression.

  Syntax

  The syntax to use this method is as follows:

  string.replace(searchValue, newValue)
  

  Example code

  const string = "javascript is great"
  const replaceString = string.replace('great','excellent')
  console.log(replaceString)
  

  The above code snippet returns the following:

  javascript is excellent
  

• Concat

  The concat() method joins two or more strings.

  Syntax

  The syntax to use this method is as follows:

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

  Example code

  const string = "javascript is great"
  const newString = "react is good"
  const concatedString = string.concat(" ",newString)
  console.log(concatedString)
  

  The above code snippet returns the following:

  javascript is great react is good
  

• Starts with

  The startsWith() method returns true if a string starts with a specified string.

  Syntax

  The syntax to use this method is as follows:

  string.startsWith(searchValue, start)
  

  Example code

  const string = "javascript is great"
  string.startsWith('javascript')
  ?(
  console.log('true')
  )
  : console.log('false')
  

  The above code snippet returns the following:

  true
  

• Ends with

  The endsWith() method returns true if a string starts with a specified string.

  Syntax

  The syntax to use this method is as follows:

  string.endsWith(searchValue, start)
  

  Example code

  const string = "javascript is great"
  string.endsWith('javascript')
  ?(
  console.log('true')
  )
  : console.log('false')
  

  The above code snippet returns the following:

  false
  

Hence we have learned the basic string methods. Hope this is useful for your quick revision.Thanks for reading. Happy coding!