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[JsLIGO] For-of loops with patterns instead of a variable ranging over the collection.

Christian Rinderknecht requested to merge rinderknecht@for-of into dev

Motivation and Context

For maps, we want to enable

for (const [key, value] of map) { ... }

instead of (currently):

for (const binding of map) {
  const [key, value] = binding;



  • compiler
  • website
  • webide
  • vscode-plugin
  • debugger

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to not work as expected)
  • Performance improvement (non-breaking change that improves performance)
  • None (change with no changelog)


We can now write for ([key, value] of map) { ... }.


  • If a new syntax has been introduced, put a message on slack ligo-lsp
  • Changes follow the existing coding style (use dune @fmt to check).
  • Tests for the changes have been added (for bug fixes / feature).
  • Documentation has been updated.
  • Changelog description has been added (if appropriate).
  • Start titles under ## Changelog section with #### (if appropriate).
  • There is no image or uploaded file in changelog
  • Examples in changed behaviour have been added to the changelog (for breaking change / feature).
Edited by Christian Rinderknecht

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