Course Content
Data types and Values
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Object-oriented programming in JavaScript
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Error handling and debugging in JavaScript
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JavaScript functions for string and array manipulation
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JavaScript Libraries and Frameworks
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JavaScript
About Lesson

JavaScript functions for string and array manipulation

JavaScript has a variety of built-in functions and methods that make it easy to manipulate strings and arrays. Here are some common ones:

  1. String functions:
  • CharAt(index): returns the character at the specified index of a string
  • Concat(string1, string2, …, stringX): combines two or more strings into a single string
  • IndexOf(searchValue): returns the index of the first occurrence of the specified search value in a string
  • Replace(searchValue, replaceValue): replaces the first occurrence of a specified value in a string with another specified value
  • Slice(startIndex, endIndex): extracts a section of a string and returns it as a new string
  • Split(separator): splits a string into an array of substrings based on a specified separator
  • ToLowerCase(): converts a string to lowercase
  • ToUpperCase(): converts a string to uppercase
  • Trim(): removes whitespace from the beginning and end of a string
  1. Array functions:

  • concat(array1, array2, …, arrayX): combines two or more arrays into a single array
  • filter(callback): creates a new array with all elements that pass the test implemented by the provided callback function
  • indexOf(searchElement): returns the index of the first occurrence of a specified element in an array
  • join(separator): joins all elements of an array into a string, using a specified separator
  • pop(): removes the last element from an array and returns it
  • push(element1, element2, …, elementX): adds one or more elements to the end of an array and returns the new length of the array
  • reverse(): reverses the order of the elements in an array
  • shift(): removes the first element from an array and returns it
  • slice(startIndex, endIndex): returns a section of an array as a new array
  • sort(): sorts the elements of an array in place
  • splice(startIndex, deleteCount, element1, element2, …, elementX): adds and/or removes elements from an array

By using these functions and methods, you can easily manipulate strings and arrays in your JavaScript code.