using if,else inside a string

hi folks, I'm trying to arrange a string with conditional sections which seems to be incorrect. Just looking for the right way.. the idea is:
var string = ""; var int = 2; string ="the var int mentioned here" + if(int == 2){"equals 2"}else{"doesn't equal 2"} any idea to do it the right way without having to right the whole string again for each situation?