Manipulation

NOTE

When a filter below refers to the parent value, we're talking about the value box that lives immediately above the filter.

fill

Create an array of a certain size with a default value.

Parameter
Purpose
Example

parent value

The default value to fill

"default value"

start

The starting index of the array

0

length

The number of items in the array

10

Examples

Example
Result

[
     "Default Value",
     "Default Value",
     "Default Value",
     "Default Value",
     "Default Value",
     "Default Value",
     "Default Value",
     "Default Value",
     "Default Value",
     "Default Value"
]

fill_keys

Creates an object of a certain size with a default value and a list of keys.

Parameter
Purpose
Example

parent value

The default value to fill

"default value"

keys

The array of keys to use

[
	"key1",
	"key2",
	"key3"
]

Examples

Example
Output

{
	"key1": "Default Value",
	"key2": "Default Value",
	"key3": "Default Value"
}

first_notempty

Applies the first value that is not empty (0, null, "", empty string)

Useful if you need to determine a value to apply based on what is provided, such as editing a database record and being uncertain if an input will be provided to replace a value.

Parameter
Purpose
Example

parent value

The value to check if empty

Can contain any value, or no value.

value

The value to use if the parent value is empty

"default"

Examples

first_notnull

Applies the first value that is not null

Useful if you need to determine a value to apply based on what is provided, such as editing a database record and being uncertain if an input will be provided to replace a value.

Hint

Remember, null is its own value entirely. It is not the same as "null", an empty string, or any other similar empty state.

Parameter
Purpose
Example

parent value

The value to check if null

Can be any value

value

The value to use if the parent value is null

"default"

Examples

get

Gets a value at the specified path inside of an array or object.

For arrays, the path can be an index, such as 0, 1, or 2, which will get the specific item at that index in the array.

For arrays of objects, you can specify the index + a path, such as 2.name

For single objects, you can just specify the path, such as name.

This filter is useful if you aren't sure if the value you need will exist, and need to provide a default value in place of it.

Hint

Are you getting errors in your function stacks because certain values don't exist all the time? The GET filter can be a great fix for this.

Parameter
Purpose
Example

parent value

The object or array to search for the value

This can be an object, array, a variable, or the result of one of the Get All Input functions [1] [2]

path

The path to look for inside of the parent value

For getting a specific array item: 0 For getting a specific path inside of an object: pathName For getting a specific path inside of an array of objects: 0.pathName

default value

The value to provide in place of the value that isn't found

This value can be whatever you'd like.

Examples

An age is provided in the input, so it is provided by the GET filter.
No age is provided in the input, so the default value is used instead.

has

Checks if a value is present (similar to get), but only returns a true or false.

Parameter
Purpose
Example

parent value

The object or array to search for the value

This can be an object, array, a variable, or the result of one of the Get All Input functions [1] [2]

path

The path to look for inside of the parent value

For getting a specific array item: 0 For getting a specific path inside of an object: pathName For getting a specific path inside of an array of objects: 0.pathName

Examples

An age is provided, so the filter returns true
An age is not provided, so the filter returns false

set

Replaces or inserts new data at a specified path.

Parameter
Purpose

parent value

The object or array to target with the set filter

path

The path at which to insert the supplied value

value

The supplied value to use

Examples

Replace a value with another
Set a new key inside of an object

set_conditional

Use set_conditional to set a new value in an object based on whether a condition evaluates as true.

Parameter
Purpose

parent value

The data to insert the result, such as an object

path

The path to insert the result

value

The value to insert at the specified path

conditional

The condition to check. This can either come from an earlier function,or another filter that returns a true or false

Examples

The age provided is greater than 20, so we return the value set in our set_conditional filter

set_ifnotempty

set_ifnotnull

Sets a new value in an object if the value provided is not empty. An empty value can be 0, null, or an empty string.

set_ifnotnull works the same, but only checks for null

Parameter
Purpose
Example

parent value

Where to set the value

This will usually be an existing object

path

The path to set the value if the checked value exists

"name" "age" "location"

value

The value to set if the checked value is not empty (or null)

Any value

Examples

1

First, we're getting an existing record from the database.

In this function stack, we're simulating a user submitting changes to their user profile.

2

Then, we use an Update Variable with set_ifnotempty (or set_ifnotnull) to determine whether or not the returned record needs to be updated.

3

Finally, we edit the record using the result of step 2 for all of our values.

transform

The transform filter is universal way to transform data. It works with arrays, objects, and scalar values. It uses the expression data type to specify the transformation.

Hint

This filter is similar to the map filter, except it can bind to all data - not just an array.

You can use the context variable $$ to target the parent value.

Parameter
Purpose
Example

parent value

The value to apply the transformation to

Can be any value or variable

expression

The expression to run

Any expression

Read more about expressions and Xano Transform below.

ExpressionXano Transform

Examples

[1,2,3]|transform:($$|count)                              // returns 3
[1,2,3]|transform:($$|count)+($$|sum)                     // returns 9
{first:Alpha,last:Beta}|transform:$$.first~" "~$$.last    // returns Alpha Beta

unset

Removes a key from an object

Parameter
Purpose

parent value

The object to target

path

The name of the key to remove from the object

Examples

The user record normally returns a "name", but using unset has removed it.

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