FAQ: Variables - Review

This community-built FAQ covers the “Review” exercise from the lesson “Variables”.

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In Python, it’s not necessary to declare the type of variable before assigning it a value, but it is necessary in Swift. In a line of code like this attached, it looks like there is an expression and then there are variables assigned. Do we need to create an expression and then assign the variables within the expression in Swift? The attached screenshot is an example of what I mean.

I really hope what I’m asking makes sense…

Screen Shot 2019-12-17 at 11.10.26 AM

I’m a bit confused by adding Type to the variables. It is just good practice to specify the type of each variable? Or just for numbers? Seems kind of clunky. If you say “var height = 1.85” doesn’t Swift know that it’s a floating point number?

Also, do we always need to specify what type of answer Type we want? In this case the example explicitly states that “var BMI = Double”