appendItem

Category:Variables

appendItem(list, item)

Category: Variables

Appends the item to the end of the array.

In real life you sometimes need add items to the end of the list, and make the list larger. appendItem(list, item) makes the "list" one larger and inserts the "item" at the end of the list. If the append is successful, appendItem() returns true, otherwise it returns false.

Examples

// List of favorite movies.
var myFavoriteMovies=[];
appendItem(myFavoriteMovies, "Star Wars");
appendItem(myFavoriteMovies, "Lord of the Rings");
appendItem(myFavoriteMovies, "Harry Potter");
console.log(myFavoriteMovies);

Example: Fibonacci Generate the first 10 numbers in the fibonacci sequence.

// Generate the first 10 numbers in the fibonacci sequence.
var fibonacci=[1,1];
var nextTerm=0;
for (var i=3; i<=10; i++) {
  nextTerm=fibonacci[i-2]+fibonacci[i-3];
  appendItem(fibonacci,nextTerm);
}
console.log(fibonacci);

Syntax

appendItem(list, item)

Parameters

Name	Type	Required?	Description
list	variable name	Yes	The variable name of the list (array) you want to append to the end of.
item	any type	Yes	The number or string item to be inserted at the end of the list.

Returns

Boolean true or false

Tips

List(array) manipulation functions include: appendItem(list, item), insertItem(list, index, item) and removeItem(list, index).
Multiple calls to appendItem() can be slow because to expand the list, Javascript needs to create a new list one item larger and then copy all the items over before instering the new item at the end. If possible it is better to create the list intially large enough for all the possible items and list[index] to add new items at specific positions.

Found a bug in the documentation? Let us know at documentation@code.org

Syntax

appendItem(list, item)

Found a bug in the documentation? Let us know at documentation@code.org