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iOS Swift Basics (retired) Collections Modifying an Array

Why todo+=(\space)["string"] or todo(\space)+=["string"] will not work?

there's something stange about the += operator, you have to either leave at least a space at each side or no space at all. Otherwise, if you leave at lease one space at one side but no space at the other likt the title suggested, it will not work. Why is that?

var x = ["good"] Works: x+=["bad"] x += ["bad"]

Not works: x +=["bad"] x+= ["bad"]