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Description

Get the value of a property or a default value if the object does not have the given property. If no default value is given, null is returned.

Note

This function is not supported in Spark pipelines.

See also: Checking for optional properties and returning defaults in the expression language

Syntax


object.get(field, [defaultValue])


Example

Expression: $.get("Id")

Result: Returns the value of the "Id" property or null if the object does not have the property.


Expression: $.get("Id", 123)

Result: Returns the value of the "Id" property or the number "123" if the object does not have the property.

...

DescriptionCreate a new object that retains some properties from the original as specified by the given callback.
Syntax


Code Block
object.filter(callback)
  • callback - A function that takes three arguments (property-value, property-name, input-object) and returns true if the property should be included in the returned object or false if it should be left out.
Example

Expression: $.filter((value, key) => key.startsWith("new"))

Input:

Code Block
{
      "key1": "abc",
      "key2": "xyz",
	  "newField1": "foo",
      "newField2": "bar"
    }

Result:

Code Block
{
      "newField1": "foo",
      "newField2": "bar"
    }


keys

Description

Returns an array of strings that represent all the enumerable properties of the given object. The ordering of the properties is the same as that given by looping over the properties of the object manually. See also values, entries. 

Syntax


Code Block
property.keys()


Example

Input:

Code Block
let user = {
	name: "John",
	age: 30
}

Expression: $user.keys()
Result: [name, age]

...

Expand
titleExtend Method: Converting an array into an object

A JSON Array of objects with unique/non-overlapping keys can be converted to an object using the extend object method along with a Spread Operator.  The extend object method does so by creating objects dynamically from other objects passed in as arguments, the spread operator will have to be used to indicate that the elements of the array should be treated as the arguments to the function. The expression to be used is:


Paste code macro
titleExpression using extend method to convert an array into an object
{}extend(...$<Array_name>)

1. Input the array into Mapper Snap (this can be done using a JSON Generator Snap). For this example, the following array will be used:

Paste code macro
languagejson
titleJSON Array
{
 "myArray": [
   {
     "Header1": {
       "a": 11,
       "b": 21,
       "c": 31
     }
   },
   {
     "Header2": {
       "a": 12,
       "b": 22,
       "c": 32
     }
   },
   {
     "Header3": {
       "a": 13,
       "b": 23,
       "c": 33
     }
   }
 ]
}

2. The Mapper Snap must be configured as shown below. Notice the Expression and Target path fields.

3. When executed, the output will be an object.

Note

The array should have unique keys for this method to work, if they overlap then the last element of the array will be converted.