Where does JavaScript require an expression? -

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i've been messing around figure out javascript requires expression.

is rule can't place statement in middle of existing expression?

besides in jsx, there anytime can think of when would've wanted use statement expression required? (by mean anytime did put if else statement instead of ternary expression in jsx)

here links code trying figure out expression required.

https://repl.it/ld8n/0

https://repl.it/ldii/1


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