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Symmetric list creator

World's simplest list tool

This is a super simple browser-based application that turns any list into a symmetric list. As soon as you load your list into the input area, you will get a symmetric list in the output. The items will be copied from the original list so that the new list has the same elements going both directions (left to right and right to left). You can switch between three symmetry modes and remove empty list items. You can also use different list formats and customize the input and output separators of items. Created by list geeks from team Browserling.
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Item Delimiting Symbol
If delimiter is a single character, separate the items with it.
If delimiter is multiple characters, specify the appropriate regexp.
Set the character or regular expression.
List Symmetry Type
For example: "a, b, c" → "a, b, c, c, b, a".
For example: "a, b, c" → "a, b, c, b, a".
For example: "a, b, c, b" → "a, b, c, b, a".
Symmetric List Options
Set this separator character for the symmetric list.
Avoid empty items in the symmetric list.
Symmetric list creator tool What is a symmetric list creator?
This online utility creates symmetrical lists. A symmetrical list is also known as a palindromic list. Such lists can be read from the beginning to end and from the end to beginning and in both directions they will have the same items. For example, a list "x, y, z, y, x" is a palindromic list because it has the same items from the beginning and end. Here's a more detailed example. If you have another list "a, b, b", then this program makes it symmetrical by adding as many items as required to form symmetry. There are several symmetry types possible for this list. The first one is called mirror symmetry and it duplicates absolutely all the items of the given list in reverse order. In this case, the mirror-symmetric list would be "a, b, b, b, b, a" (the underlined items are the added items, which are the reversed original list). The second type is called centered symmetry. In this case, all the items except the last one are duplicated and the last one is the only item without a matching pair. In this symmetry mode, the list looks like this "a, b, b, b, a" (the underlined items are the new added items that form a symmetric list). The third type of symmetry is called minimal symmetry. When this type is used, the application creates symmetry by trying to add the minimum number of possible items to the list. Here, we get the following list: "a, b, b, a" (only one underlined item had to be added to form a symmetric list). You can create all these symmetry types from any list of any format. You just need to specify which item separator is used in the list. If it is a regular character (such as a comma, a space, or a semicolon), you can specify it in the options. If it is several different characters (such as space and a newline, or a comma and a semicolon), you can match them using a regular expression. Also, you can specify a new separating symbol for the symmetric list and ignore empty items when forming a symmetric list. Listabulous!
Symmetric list creator examples Click to use
Create a Centered Symmetry
In this example, we create a symmetric list from Unicode blocks. The input blocks are placed in order from the smallest to largest and they are separated by a space character. Therefore, we specify the input item separator character to be a space and we select the centered symmetry mode. As a result, the last (tallest block) remains in the center and all other blocks are duplicated in reverse order, creating a symmetric wave.
▁ ▂ ▃ ▄ ▅ ▆ ▇ █
▁ ▂ ▃ ▄ ▅ ▆ ▇ █ ▇ ▆ ▅ ▄ ▃ ▂ ▁
Required options
These options will be used automatically if you select this example.
If delimiter is a single character, separate the items with it.
Set the character or regular expression.
For example: "a, b, c" → "a, b, c, b, a".
Set this separator character for the symmetric list.
Avoid empty items in the symmetric list.
Mirror a List of Greek Letters
In this example, we load a list of Greek uppercase letters and make the list symmetrical. The letters use various delimiters, including spaces, tabs, and newlines. With the help of a regular expression "/\s+/", we are able to match all these whitespace delimiters and split the list into individual letters. Next, we create a mirrored symmetry list where every item has a duplicate (starting from Ω and going backward).
Α Β Γ Δ Ε Ζ Η Θ Ι Κ Λ Μ Ν Ξ Ο Π Ρ Σ Τ Υ Φ Χ Ψ Ω
Α Β Γ Δ Ε Ζ Η Θ Ι Κ Λ Μ Ν Ξ Ο Π Ρ Σ Τ Υ Φ Χ Ψ Ω Ω Ψ Χ Φ Υ Τ Σ Ρ Π Ο Ξ Ν Μ Λ Κ Ι Θ Η Ζ Ε Δ Γ Β Α
Required options
These options will be used automatically if you select this example.
If delimiter is multiple characters, specify the appropriate regexp.
Set the character or regular expression.
For example: "a, b, c" → "a, b, c, c, b, a".
Set this separator character for the symmetric list.
Avoid empty items in the symmetric list.
Minimal Symmetry List
In this example, we create symmetry from a list of classical elements. Some of the words are already duplicated in the list, so we don't have to copy all the items to create symmetry. We split the items by newline, remove empty items, and apply the minimal symmetry method. As a result, only the first two items had to be added in reverse order to the list to make it symmetric.
Fire Air Water Earth Water
Fire Air Water Earth Water Air Fire
Required options
These options will be used automatically if you select this example.
If delimiter is a single character, separate the items with it.
Set the character or regular expression.
For example: "a, b, c, b" → "a, b, c, b, a".
Set this separator character for the symmetric list.
Avoid empty items in the symmetric list.
Pro tips Master online list tools
You can pass input to this tool via ?input query argument and it will automatically compute output. Here's how to type it in your browser's address bar. Click to try!
https://onlinelisttools.com/create-symmetric-list?input=%E2%96%81%20%E2%96%82%20%E2%96%83%20%E2%96%84%20%E2%96%85%20%E2%96%86%20%E2%96%87%20%E2%96%88&string-separator=true&input-separator=%20&join-character=%20¢ered=true&skip-empty=false
All list tools
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Quickly print all distinct items of a list.
Quickly print all repeating items of a list.
Quickly count the number of items in a list.
Quickly find certain items in a list.
Quickly print all list items in reverse order.
Quickly sort list items alphabetically or numerically.
Quickly shuffle list items and make it random.
Quickly randomly pick one or more items from a list.
Quickly create a downloadable image from a list.
Quickly display list items in multiple colors.
Quickly set a new delimiter for items in a list.
Quickly remove the symbol that separates list items.
Quickly change list item delimiters to the same symbol.
Quickly remove items from the beginning or end of a list.
Quickly join all items of a list together.
Quickly create groups of multiple list items.
Quickly extract a part of a list.
Quickly remove all empty items from a list.
Quickly remove whitespace characters around list items.
Quickly create multiple copies of a list.
Quickly rotate list items to the left or right (or up and down).
Quickly enumerate list items and add a counter to them.
Quickly add bullet markers to all items in a list.
Quickly wrap all list items in quotes.
Quickly remove all quotation marks from around list items.
Quickly add text on the left and right sides of all list items.
Quickly remove text from the left and right sides of all list items.
Quickly prepend a prefix before each list item.
Quickly delete any prefix from the beginning of all list items.
Quickly append a suffix after each list item.
Quickly delete any suffix from the end of all list items.
Quickly add or remove list items to make it a certain length.
Quickly create multiple columns from a single list.
Quickly create a palindromic list from the given list.
Quickly generate a list of arbitrary length with arbitrary items.
Quickly generate a random length list with random items.
Quickly add new items at the beginning or end of a list.
Quickly left-pad a list with one or more items.
Quickly right-pad a list with one or more items.
Quickly analyze a list and print its item statistics.
Coming soon These list tools are on the way
Edit a List
View and edit lists in a neat browser-based list editor.
Split a List
Split list items into chunks.
Generate the Powerlist
Create the powerlist of the given list.
Find the Car of a List
Extract the first item from a list.
Find the Cdr of a List
Extract all items except the first of a list.
Apply a Function on a List
Run a JavaScript function on every list item.
Delete List Item
Quickly remove certain items from a list.
Find Certain List Items
Quickly find and print items that interest you in a list.
Find Non-repeating List Items
Quickly find and print items that don't repeat in a list.
Find Repeating List Items
Quickly find and print items that repeat in a list.
Delete Repeating List Items
Quickly find and remove items that repeat in a list.
Delete Unique List Items
Quickly find and remove items that are unique in a list.
Extract a Sublist from a List
Given start and stop indexes, extract a sublist from a list.
Shift List Items
Shift list items to the left or right (or up and down).
Indent List Items
Add indentation to all list items.
Mirror a List
Quickly create a mirror copy of a list.
Invert a List
Invert the order of items in a list (last becomes first, etc).
Reduce a List
Run the reduce function on a list.
Convert a List to Rows
Create multiple rows from a single list.
Convert a List to Excel
Create an Excel file from a list.
Convert a List to PDF
Create a PDF file from a list.
Convert a Text List to a LaTeX List
Create a LaTeX list from a regular text list.
Convert a Text List to a HTML List
Create a HTML list from a regular text list.
Convert a Text List to a Markdown List
Create a Markdown list from a regular text list.
Compare Two Lists
Find the difference between two lists.
Compare Three Lists
Find the difference between three lists.
Remove One List from Another
Remove elements from a list that appear in the other list.
Zip Two Lists
Join two lists together item by item.
Merge Two Lists
Append a second list at the end of the first list.
Pair List Items
Create pairs from all list items.
Pop List Items
Remove list items at certain index positions.
Push List Items
Add new items at the end of a list.
Replace List Items
Replace certain items in a list with new items.
Splice a List
Modify a list in-place by adding, replacing, or removing items.
Flatten a List
Remove all indentation levels from a list and make it flat.
Make List Items Title Case
Quickly change the letter case of all items to title case.
Make List Items Proper Case
Quickly change the letter case of all items to proper case.
Make List Items Random Case
Quickly randomly change the letter case of all items.
Make List Items Lowercase
Quickly change the letter case of all items to small letters.
Make List Items Uppercase
Quickly change the letter case of all items to capital letters.
Remove List Item Bullets
Quickly remove any bullet marks before items in a list.
Remove List Item Counter
Quickly remove any numeration from a list of items.
Create the Empty List
Generate a list with no items.
Visualize a List
Quickly create a graphical representation of a list.
Create a List Cloud
Create an image with a cloud of list items.
Let Zalgo Destroy a List
Let Zalgo loose on a list and create list-chaos.