Issue 1304 change var to const/let

[jenny-alexander]

Fixes #1304 (<=== Add issue number here)

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[cesswairimu]

Hi @jenny-alexander , this is looking good. I noticed you added some spaces on this line, 58 and 73. Its not a big deal but we have the previous style across the other js files and maybe we should keep the same here. What do you think?
Thanks for working on this

[jenny-alexander]

Hi @cesswairimu, thank you for your feedback. I changed my code editor preferences to not format on save. Can you please check again that the changes are as requested?
Thanks.

[cesswairimu]

Looks great 🎉
Thanks @jenny-alexander

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[7malikk]

Congratulations on your merge @jenny-alexander