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gonull-coalescing

How to assign the first non-empty/nil value?

This can be done in python / javascript:

# Python:
a = ""
b = "test"
c = a or b # test

// javascript
a = "";
b = "test";
c = a || b; // test

Can the same be accomplished in go without doing some conditional block? The only way I'm able to do this so far is with conditional blocks...

a := ""
b := "test"
var c
if a {
    c = a
} else {
    c = b
}

I think this is answer is going to be "no, this cannot be done", but I figured I would ask just in case I'm wrong. The example here is simplified. The variables a and b could have been defined long ago...

Solution

  • From golang FAQ, There is no ternary testing operation in Go. You may use the following to achieve the same result:

    if expr {
    n = trueVal
} else {
    n = falseVal
}