Feature #3570: Add a function or instruction like ixsl:remove-property - SaxonJS - Saxonica Developer Community

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Feature #3570

closed

Add a function or instruction like ixsl:remove-property

Added by Pieter Masereeuw over 6 years ago. Updated almost 4 years ago.

Status:

Closed

Priority:

Low

Assignee:

Debbie Lockett

Category:

IXSL extensions

Sprint/Milestone:

Start date:

2017-12-12

Due date:

% Done:

100%

Estimated time:

Applies to JS Branch:

Fix Committed on JS Branch:

Trunk

Fixed in JS Release:

Saxon-JS 2.0

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Description

It would be nice to have a Saxon-JS extension function to explicitly remove a property (other than giving it some special value, such as the empty string; an empty sequence is not allowed)

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Updated by Debbie Lockett about 6 years ago

Consider this for Saxon-JS 2.0, and Saxon 9.9.

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Updated by Debbie Lockett about 6 years ago

Subject changed from Add a functionor instruction like ixsl:remove-property to Add a function or instruction like ixsl:remove-property

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Updated by Debbie Lockett about 4 years ago

Description updated (diff)
Status changed from New to In Progress

Code committed on Saxon 10.0 dev branch to add the IXSL extension instruction <ixsl:remove-property>. The instruction can be used to remove a named property from a JavaScript object. It has mandatory attribute name (the name of the property to be removed, or dot-separated composite name), and optional attribute object (the object that the property belongs to, or when omitted, the window object is used). i.e. these attributes align with those on <ixsl:set-property>.

ixsl:set-property can be used to set a property to null; but ixsl:remove-property would allow to actually remove own properties from objects. Note that inherited properties can not be removed. This can be implemented using the JavaScript delete operator (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/delete). There is some Saxon-JS 2 implementation detail to work out here about whether we should throw a run time error, or produce a warning, in the cases when either the property doesn't exist, or the property cannot be removed.

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