This is a quick reference list of JavaScript array methods and properties with examples of how they are used.

• JavaScript – Array concat() Method
  The Array concat() method joins two or more arrays, returning a new array containing the joined arrays, without changing the existing arrays.
• JavaScript – Array constructor Property
  The Array constructor property returns the function that created the Array prototype.
• JavaScript – Array copyWithin() Method
  The Array copyWithin() method copies array elements to another position in an array, overwriting the existing values.
• JavaScript – Array entries() Method
  The Array entries() method returns an array iterator object that shows the key and value pairs currently existing within the array.
• JavaScript – Array every() Method
  The Array every() method executes a function for each array element, returning true if the function returns true or false.
• JavaScript – Array fill() Method
  The Array fill() method fills specified elements in an array with a value, overwriting the original array.
• JavaScript – Array filter() Method
  The filter() method creates a new array filled with elements that pass a test provided by a function, leaving the existing array unchanged.
• JavaScript – Array find() Method
  The Array find() method executes a function for each array element and returns the value of the first element that passes a test.
• JavaScript – Array findIndex() Method
  The Array findIndex() method executes a function for each array element, and returns the index (position) of the first element that passes a test.
• JavaScript – Array forEach() Method
  The Array forEach() method calls a function, running it for each item in an array.
• JavaScript – Array.from() Method
  The Array.from() method returns an array from any object with a length property.
• JavaScript – Array includes() Method
  The Array includes() method returns true if an array contains a specified value, and returns false if the value is not found.
• JavaScript – Array indexOf() Method
  The Array indexOf() method returns the first index position of a specified value, and returns -1 if the value is not found in the array.
• JavaScript – Array.isArray() Method
  The Array.isArray() method tests an object to determine if it’s an array. It returns true if an object is an array and false if the object is not.
• JavaScript – Array length Property
  The Array length property sets or returns the number of elements in an array.
• JavaScript – Array join() Method
  The Array join() method returns an array as a string leaving the original array unchanged.
• JavaScript – Array map() Method
  The Array map() method creates a new array by calling a function for every array item.
• JavaScript – Array keys() Method
  The Array keys() method returns an array iterator object containing the keys of a specified array.
• JavaScript – Array pop() Method
  The Array pop() method removes and returns the last element of an array, changing the original array.
• JavaScript – Array lastIndexOf() Method
  The lastIndexOf() method returns the last position of a specified value, searching from right to left, returning -1 if the value is not found.
• JavaScript – Array.prototype Property
  The Array.prototype property allows new properties and methods to be added to existing arrays.
• JavaScript – Array push() Method
  The Array push() method adds new items to the end of an array, changing the length of the array.
• JavaScript – Array reduce() Method
  The reduce() method executes a reducer function for every array item, returning a single value representing the function’s accumulated result.
• JavaScript – Array reduceRight() Method
  The Array reduceRight() method executes a reducer function for every array item, working from right to left, returning a single value.
• JavaScript – Array reverse() Method
  The Array reverse() method reverses the order of the items in an array, overwriting the original array.
• JavaScript – Array shift() Method
  The Array shift() method removes and returns the first element of an array, changing the original array.
• JavaScript – Array slice() Method
  The Array slice() method returns selected elements in an array as a new array, without changing the original array.
• JavaScript – Array some() Method
  The Array some() method checks if any array elements pass a test by executing a callback function for each array element.
• JavaScript – Array sort() Method
  The Array sort() method sorts the elements of an array as strings in alphabetical and ascending order, overwriting the original array.
• JavaScript – Array splice() Method
  The Array splice() method adds and/or removes array elements, overwriting the original array.
• JavaScript – Array toString() Method
  The Array toString() method returns a string with array values separated by commas, and does not change the original array.
• JavaScript – Array unshift() Method
  The Array unshift() method adds new elements to the beginning of an array, overwriting the original array.
• JavaScript – Array valueOf() Method
  The Array valueOf() method returns the value of the array (contents), and does not change the original array.