values in not clearing between exercises

[bxie]

Values in memory tables still appear even when switching exercises. May be a larger issue where correctness not being checked correctly for edge cases where prior memory table exercise had a table which was longer than new table.

To replicate:

1. Go to memory table exercise (e.g. practice read float equality)
2. put values into memory table
3. using side nav, click on a different memory table exercise

expected: memory table is cleared when new exercise selected actual: memory table shows values from previous table

Should be easy fix. Probably just clear the data in state.responses(?) during componentDidUnmount

• [x] memory tables
• [x] write code

[bxie]

memory table now clears on question change 11b43397b4fd0abee0cf3c8350118d4e7772506a

[bxie]

fixed by updating state on componentDidUpdate()