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isEmpty

DataWeave 2.2 is compatible and bundled with Mule 4.2. This version of Mule reached its End of Life on May 2, 2023, when Extended Support ended.

Deployments of new applications to CloudHub that use this version of Mule are no longer allowed. Only in-place updates to applications are permitted.

MuleSoft recommends that you upgrade to the latest version of Mule 4 that is in Standard Support so that your applications run with the latest fixes and security enhancements.

isEmpty(Array<Any>): Boolean

Returns true if the given input value is empty, false if not.

This version of isEmpty acts on an array. Other versions act on a string or object, and handle null values.

Parameters

Name Description

elements

The input array to evaluate.

Example

This example indicates whether the input array is empty.

Source

%dw 2.0
output application/json
---
[ isEmpty([]), isEmpty([1]) ]

Output

[ true, false ]

isEmpty(String): Boolean

Returns true if the input string is empty, false if not.

Parameters

Name Description

value

A string to evaluate.

Example

This example indicates whether the input strings are empty.

Source

%dw 2.0
output application/json
---
[ isEmpty(""), isEmpty("DataWeave") ]

Output

[ true, false ]

isEmpty(Null): Boolean

Returns true if the input is null.

Parameters

Name Description

value

null is the value in this case.

Example

This example indicates whether the input is null.

Source

%dw 2.0
output application/json
---
{ "nullValue" : isEmpty(null) }

Output

{ "nullValue": true }

isEmpty(Object): Boolean

Returns true if the given object is empty, false if not.

Parameters

Name Description

value

The object to evaluate.

Example

This example indicates whether the input objects are empty.

Source

%dw 2.0
output application/json
---
[ isEmpty({}), isEmpty({name: "DataWeave"}) ]

Output

[ true, false ]