How to break a loop in TypeScript

Question

I have a the below code, on which i am unable to break the loop on certain conditions.

Expected Result : Error message should appear and user should be able to close the message and remove the escalation node properly

Actual Result : User Cannot remove the Error message by clicking ok..it automatically disappear within several minutes

public findVerticesBelow(vertexId: number) {
    // debugger
    this.recussionTime++;
    if(this.recussionTime <= 150){
        console.log(this.recussionTime)
        if (!this.vertexIdList.includes(vertexId)) {
            this.vertexIdList.push(vertexId)
          }
          let tempvertexIdList: Array<number> = new Array<number>();
          this.edges.forEach(edge => {
            if (edge.fromId == vertexId) {
              tempvertexIdList.push(edge.toId);
            }
          })

          tempvertexIdList.forEach(tempvertexId => {
            this.findVerticesBelow(tempvertexId)
          });
    }else{
        // debugger
        console.log("AAAAAAAAAAAAAAA")
        // alert("You are having a recursive loop please remove it before trying to remove nodes")
        // alert("ASCDFVGBHN")
    }
  }

I want to break the code and return the boolean value, but I am unable to do it right now. Can anybody help me.

`break` doesn't work inside forEach, see [this](https://stackoverflow.com/questions/6260756/how-to-stop-javascript-foreach) — Ramesh Reddy, Jan 01 '20 at 10:02
Hi @Ramesh How can I stop it. this console.log("AAAAAAAAAAAAAAA") running every time — qwertyuio, Jan 01 '20 at 10:45

score 1 · Accepted Answer · answered Jan 01 '20 at 11:21

1

This is not proper way but you can use it

let a=[1,2,3,3,4,4,4];
try{
   a.forEach((x,y)=>{
    console.log(x);
    if(x==4){
       throw "break";
    }
   })
}catch(e){
console.log(e);
}

answered Jan 01 '20 at 11:21

kelvin kantaria

1,438
11
15

score -1 · Answer 2 · answered Jan 01 '20 at 10:13

-1

You cann't stop the forEach loop in any JavaScript or TypeScript file. If want to use break you can simply use the for loop. If you want to learn more click here!

answered Jan 01 '20 at 10:13

Zubaid Rasool

13
4

Binara Thambugala · Answer 3 · 2020-01-01T11:23:48.003

It is not possible to break from forEach normally.Use the for loop instead of forEach.

There are 3 things which you might have not known about the forEach loop.

"return" doesn’t stop looping.
You cannot ‘break’.
You cannot ‘continue’.

Read more : https://medium.com/front-end-weekly/3-things-you-didnt-know-about-the-foreach-loop-in-js-ff02cec465b1

Or

you can use Array.every() if you wish to return false while breaking the loop.

If you want to return true, then you can use Array.some()

How to break a loop in TypeScript

3 Answers3