I have a custom item:
export class PartsChildInfo {
name: string;
materialName: string;
thickNess: number;
}
export class PartGroupInfo
{
materialName: string;
thickNess: number;
}
for example, i have a list item PartsChildInfo:
list : PartsChildInfo = [
{ Name = "GA8-0608" , MaterialName = "SS" , ThickNess = 1 };
{ Name = "05F1-051" , MaterialName = "SUS" , ThickNess = 2 };
{ Name = "2B73-002" , MaterialName = "AL" , ThickNess = 3 };
{ Name = "01-20155" , MaterialName = "SS" , ThickNess = 1 };
{ Name = "02MEG099" , MaterialName = "SUS" , ThickNess = 2 }; ]
i want to get the list as below with MaterialName,ThickNess the same from list :
testChildList : PartGroupInfo = [
{ MaterialName = "SS" , ThickNess = 1 };
{ MaterialName = "SUS" , ThickNess = 2 };
{ MaterialName = "AL" , ThickNess = 3 }; ]
i'm using Typescript Angular
i have tried this
testChildList : PartGroupInfo[] = [];
for (let i = 0; i < list.length; i ) {
let targeti = list[i];
for (let j = 0; j < this.testChildList.length; j ) {
let targetj = this.testChildList[j];
if (targeti.materialName != targetj.materialName && targeti.thickNess != targetj.thickNess) {
let item = new PartGroupInfo();
item.materialName = targeti.materialName;
item.thickNess = targeti.thickNess;
this.testChildList.push(item);
}
}
}
but return list is null. how should i fix it?
CodePudding user response:
Perhaps use .forEach
to iterate the list
array, check the item is existed in testChildList
via index
. Push the item
to testChildList
when index is -1 (no existed).
this.list.forEach((item) => {
var i = this.testChildList.findIndex(
(x) =>
x.materialName == item.materialName && x.thickNess == item.thickNess
);
if (i == -1)
this.testChildList.push({
materialName: item.materialName,
thickNess: item.thickNess,
});
});