I need to have the index of an object in array so I can delete this part of the array. I tried using this:
var index = this.urenRegistratie.indexOf(newDatum);
But it keeps returning -1 and I don't know why this is happening.
this is the part of the code I have. it gets data out of a form in html and places that into my array, now I already have an if statement ready ( exisitingDatum ) , my code needs to be in there. Can someone please help me out a bit?
store(newValue:number, newDatum, newAanwezig, newComment){
const existingDatum = this.urenRegistratie.find(billable => {
return billable.datum === newDatum;
return
});
if (!existingDatum) {
let billable = new BillableHours();
billable.datum = newDatum;
billable.hours = +newValue;
billable.aanwezig = newAanwezig;
billable.comment = newComment;
if(billable.aanwezig == "Aanwezig" && billable.hours !== 0 && billable.datum !== null) {
this.urenRegistratie.push(billable);
}
}
if(existingDatum) {
}
}
The findIndex() method returns the index of the first element in the array that satisfies the provided testing function. Otherwise, it returns -1, indicating that no element passed the test.
If you have array of objects like this, then try to use findIndex
:
const a = [
{ firstName: "Adam", LastName: "Howard" },
{ firstName: "Ben", LastName: "Skeet" },
{ firstName: "Joseph", LastName: "Skeet" }
];
const index = a.findIndex(x => x.LastName === "Skeet");
console.log(index);