Typescript: [Feature] Lift Assignment out of an if statement conitional

[IamManchanda]

Inspiration: Kotlin

This code below

    if (age < 18) {
       message = "You are too young to vote"
    } else if (age === 100) {
        message = "Congratulations"
    } else {
        message = "You can vote"
    }

can be converted like this for productivity and brevity

    message = if (age < 18) {
        "You are too young to vote"
    } else if (age == 100) {
        "Congratulations"
    } else {
        "You can vote"
    }

[IamManchanda]

Also when (though it might not feel javascript-like like above mentioned)

   message = when {
        (age < 18) -> "You are too young to vote"
        (age == 100) -> "Congratulations"
        else -> "You can vote"
    }

[j-oliveras]

You can do it:

message = age < 18 ?
        "You are too young to vote" :
    age == 100 ?
        "Congratulations" :
        "You can vote"

Typescript will not add new syntax if is not added to ecmascript first.

[RyanCavanaugh]

See https://github.com/tc39/proposal-do-expressions

[IamManchanda]

@RyanCavanaugh This looks cool and neat, the do expression
Sorry I am unfamiliar but what's the ES6 stage number that will let typescript have this do expression in the core?

[IamManchanda]

@j-oliveras I know with ternary but as you might know that's not readable and I have whole JS community backed up with this 😄

I really feel do expressions are great! Thanks @RyanCavanaugh, Microsoft, Ecma & Rest :)