fix: Fix toggleCollapsed handling sparse arrays

[Suntgr]

Fixes #92

Problem

The toggleCollapsed method in ArrayGroup component has a bug when handling sparse arrays. When this.state.expanded is a sparse array (e.g., only some indices are set to true while others are undefined), expanding and collapsing groups may trigger the wrong group to collapse or expand. This causes state inconsistencies where clicking on one group affects other groups unexpectedly.

Root Cause

The original implementation used for...in loop which only iterates over defined indices in sparse arrays. This leads to:

• Missing indices in the new array
• Incorrect toggle behavior when switching undefined indices
• State inconsistencies

Solution

• Replace for...in with a standard for loop to ensure all required indices are processed
• Calculate the maximum length needed (current array length or target index + 1)
• Explicitly initialize undefined indices to false to avoid sparse array issues
• Use strict equality check (=== true) for clarity

Changes

• Modified toggleCollapsed method to properly handle sparse arrays
• Ensures all indices are correctly initialized and toggled

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Project	Deployment	Review	Updated (UTC)
react-json-view	Ready	Preview, Comment	Jan 11, 2026 2:57pm

[Kikobeats]

amazing, thanks a lot!