Index Function vs Square Bracket

Question

In Appian we can use a records fields by square bracket notation or index or dot notation. 
 what to use where ,what is the best practices , i heard indexing is the best.in some places its not working ,i don't have clear understating

Abhishek Karumuru · Answer

hi Dinesh Arumugam There is one important difference. index() returns a copy of the data. square-bracket-notation returns a reference to the original data. it is crucial for using more complex data structures in saveInto where index() might not work.

Abhishek Karumuru · Answer

hi Dinesh Arumugam try taking some text field component and have one saveinto with square bracket logic and another with index. you might see the difference

Stefan Helzle · Answer

The issue with index() is, that it returns a copy of the data, but not a reference. Square brackets return a reference you can use as a saveInto target.

Index Function vs Square Bracket

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