Is Iterating Over Elements Using Angular4/Typescript's ForEach Possible?

Question

Is Iterating Over Elements Using Angular4/Typescript's ForEach Possible?

While searching for information, I noticed many responses regarding the use of ngFor. However, my question pertains to the angular.forEach() method utilized in my Angular 1 controllers. Unfortunately, these are being identified as errors in TS and fail to compile.

As an illustration, here is a snippet featuring a nested loop:

 _this.selectChildren = function (data, $event) {
  var parentChecked = data.checked;
  angular.forEach(_this.hierarchicalData, function (value, key) {
    angular.forEach(value.children, function (value, key) {
      value.checked = parentChecked;
    });
  });
};

I am curious about how this concept translates to Typescript for Angular 4. Any guidance on this matter would be much appreciated.

javascript angular typescript foreach

Answer 1

Answer №1

When using Angular 4, you can implement a foreach loop in the following manner:

 selectChildren(data, $event) {
      let parentChecked = data.checked;
       this.hierarchicalData.forEach(obj => {
          obj.forEach(childObj=> {
            value.checked = parentChecked;
         });
      });
    }

Answer 2

When using Angular 4, you can implement a foreach loop in the following manner:

 selectChildren(data, $event) {
      let parentChecked = data.checked;
       this.hierarchicalData.forEach(obj => {
          obj.forEach(childObj=> {
            value.checked = parentChecked;
         });
      });
    }

Answer 3

Answer №2

If you're looking to experiment with TypeScript, consider using the For loop:

selectAllDescendants(data , $event){
   let parentChecked : boolean = data.checked;
   for(let node of this.hierarchicalData){
      for(let childNode of node){
         childNode.checked = parentChecked;
      }
   }
}

Answer 4

If you're looking to experiment with TypeScript, consider using the For loop:

selectAllDescendants(data , $event){
   let parentChecked : boolean = data.checked;
   for(let node of this.hierarchicalData){
      for(let childNode of node){
         childNode.checked = parentChecked;
      }
   }
}

Answer 5

Answer №3

for (let i = 0; i < arrayData.length; i++) {
    const key = arrayData[i];
    key['index'] = i + 1;

    arrayData2.forEach((keys : any, vals :any) => {
        if (key.group_id == keys.id) {
            key.group_name = keys.group_name;
        }
    })
}

Answer 6

for (let i = 0; i < arrayData.length; i++) {
    const key = arrayData[i];
    key['index'] = i + 1;

    arrayData2.forEach((keys : any, vals :any) => {
        if (key.group_id == keys.id) {
            key.group_name = keys.group_name;
        }
    })
}

Answer 7

Answer №4

    elementList.forEach((item: any) => {
this.objects = item;
}

Answer 8

    elementList.forEach((item: any) => {
this.objects = item;
}

Answer 9

Answer №5

To implement the For Each loop in Typescript, follow the example code snippet demonstrated below:

selectChildren(data, $event) {
let parentChecked = data.checked;
for(let obj of this.hierarchicalData)
    {
        for (let childObj of obj )
        {
            value.checked = parentChecked;
        }
    }
}

Answer 10

To implement the For Each loop in Typescript, follow the example code snippet demonstrated below:

selectChildren(data, $event) {
let parentChecked = data.checked;
for(let obj of this.hierarchicalData)
    {
        for (let childObj of obj )
        {
            value.checked = parentChecked;
        }
    }
}

Is Iterating Over Elements Using Angular4/Typescript's ForEach Possible?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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