# \[Solved\] What's the real purpose of "then do"?

**URL:** <https://community.thunkable.com/t/solved-whats-the-real-purpose-of-then-do/2768439>\
**Category:** Questions about Thunkable X\
**Created:** [January 4, 2024, 10:42pm UTC](https://community.thunkable.com/t/solved-whats-the-real-purpose-of-then-do/2768439 "2024-01-04T22:42:47Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![steve\_synopsis](https://avatars.discourse-cdn.com/v4/letter/s/48db29/32.png) [@steve\_synopsis](https://community.thunkable.com/u/steve_synopsis)\
**Post date:** [January 4, 2024, 10:42pm UTC](https://community.thunkable.com/t/solved-whats-the-real-purpose-of-then-do/2768439/1 "2024-01-04T22:42:47Z")

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There are quite a few blocks that have a “then do” option. Is there any real difference between putting blocks in the “then do” section and putting then immediately after the block?

So using a Call block as below - what is the difference?

 ![2024-01-04 18 38 56](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/5/4/547fd50d1af6438b5c74b5576723dc40c2de389b.png)

Steve

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**Author:** ![tatiang](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/tatiang/32/55482_2.png) [@tatiang](https://community.thunkable.com/u/tatiang)\
**Post date:** [January 4, 2024, 11:32pm UTC](https://community.thunkable.com/t/solved-whats-the-real-purpose-of-then-do/2768439/2 "2024-01-04T23:32:05Z")

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Yes, there is a big difference. The “then do” section only happens after the function block (call Bluetooth\_Low\_Energy) _completes_. If you put the block(s) below the function instead, they happen a millisecond after the function block _starts_ regardless of how long the function takes to complete.

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**Author:** ![steve\_synopsis](https://avatars.discourse-cdn.com/v4/letter/s/48db29/32.png) [@steve\_synopsis](https://community.thunkable.com/u/steve_synopsis)\
**Post date:** [January 4, 2024, 11:45pm UTC](https://community.thunkable.com/t/solved-whats-the-real-purpose-of-then-do/2768439/3 "2024-01-04T23:45:01Z")

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Thanks

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**Author:** ![matt\_conroy](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/matt_conroy/32/150843_2.png) [@matt\_conroy](https://community.thunkable.com/u/matt_conroy)\
**Post date:** [January 5, 2024, 2:06pm UTC](https://community.thunkable.com/t/solved-whats-the-real-purpose-of-then-do/2768439/4 "2024-01-05T14:06:52Z")

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