ES6 - Prevent Object Mutation - Free Code Camp

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I have been doing this for a good 3minutes and this is the result i am getting "[TypeError: Cannot assign to read only property 'PI' of object '#<Object>']"

mwelwaphiri
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Man, I know that this is 2 years old video, however, I really appreciate your videos.

Franck_Major_X
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Hi Ian,
Just wanted to inform you that one more challenge "Mutate and Array using const has been added before this challenge"

vedanthbaliga