pug - Changing a variable inside a if - jade/pugjs -

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i'm trying make div have location inside of based on state of 2 variables, example if $city = 'new york' , $state = 'ny' div display new york, ny. however, it's not working , think has scoping. here's jade:

$city = data.city $state = data.state $locstring = ""  if $city != ""     $locstring = $locstring + $city if $city != "" && $state != ""     $locstring = $locstring + ", " if $state != ""     $locstring = $locstring + $state  .location #{$locstring}

this ending $locstring being empty, if print off $locstring inside if statements has added value, suggesting redeclaring local copy of variable inside of each if statement. can't find in reference http://jade-lang.com/reference/

i woud suggest this: 

- var city = data.city - var state = data.state - var locstring = ""  if city != ""     - locstring = locstring + city if city != "" && state != ""     - locstring = locstring + ", " if state != ""     - locstring = locstring + state

take care of "var" , "-".

check "variables" part on -> https://naltatis.github.io/jade-syntax-docs/


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