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Using named parameters in JavaScript (based on TypeScript)

rated 0 times [ 115] [ 1] / answers: 1 / hits: 59406 / 7 Years ago, wed, february 8, 2017, 12:00:00

I have problems when using named parameters in TypeScript. I know it is not supported the way I use it in TypeScript.

But how can I do it?

TypeScript:

SomeFunction(name1: boolean, name2: boolean, name3: boolean, name4: boolean) // Will occur only one time, so the change should be in TypeScript

JavaScript:

$(function () {

     ...SomeFunction({name1:false, name2:false, name3:false, name4:true}); // Will occur 100 times

});

I was looking at (this did not work out):

Is there a way to provide named parameters in a function call in JavaScript?

How can I add optional named parameters to a TypeScript function parameter?

What can I do in TypeScript, to use named parameters in JavaScript?

What I wonder is, that Visual Studio 2015 did not show a syntax error when using named parameter the way I used it in TypeScript...

PS.: I use TypeScript 2.1

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cameron

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1 Year ago

answered 7 Years ago nicholas · Accepted Answer

True named parameters don't exist in JavaScript nor in TypeScript but you can use destructuring to simulate named parameters:

interface Names {

    name1: boolean

    name2: boolean

    name3: boolean

    name4: boolean

}



function myFunction({name1, name2, name3, name4}: Names) {

    // name1, etc. are boolean

}

Notice: The type Names is actually optional. The following JavaScript code (without typing) is valid in TS:

function myFunction({name1, name2, name3, name4}) {

    // name1, etc. are of type any

}