Equivalent of object... from java in angular [duplicate]

Question

In Java, we can do something like :

void myFunction(int... ints) {
   // ints will be int[], that will never be null
}

// both call method will works :
myFunction();
myFunction(0, 1, 5);

But, in angular:

myFunction(obj?: MyObj[]) {
   // obj will be an array that can be null
   // obj will by typed as "MyObj[] | undefined"
}

myFunction(); // this works
myFunction(obj1, obj2); // error

But the "obj" variable can be null. Without the ? it's not possible to run the first function.

How can I do to have an argument with unknown amount of item, but never null?

You can use spread operator to make any amount of parameters myFunction(...obj: MyObj[]). Here obj will be an array of arrays. that is what you need, if i understood you correctly — ZloiGoroh
– ZloiGoroh, Commented Oct 13, 2021 at 12:25
I don't need array of array, just one simple array with unknow amount of item in it — Elikill58
– Elikill58, Commented Oct 13, 2021 at 12:27
But what you tell seems what I was looking for. I through it will create like string[][] but no — Elikill58
– Elikill58, Commented Oct 13, 2021 at 12:29
I mean, in your example obj is an array of MyObj. I gave you a solutuion to push any number of expected for this function parameters in an obj array in your function — ZloiGoroh
– ZloiGoroh, Commented Oct 13, 2021 at 12:30
Also relevant: JavaScript variable number of arguments to function | open-ended function arguments with TypeScript — VLAZ
– VLAZ, Commented Oct 13, 2021 at 12:43

ZloiGoroh · Accepted Answer · 2021-10-13 12:37:45Z

0

You can use spread operator to make any amount of parameters myFunction(...obj: MyObj[]). Here obj:Array<MyObj[]> will be an array of your MyObj arrays.

answered Oct 13, 2021 at 12:37

ZloiGoroh

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1 Comment

VLAZ Over a year ago

This is not spread (and it's not an operator), this is rest parameters syntax

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