findIndex Array method in TypeScript
Solution 1
It's not about Typescript. Javascript functions are included in Typescript. You are trying to use Lodash function. Make sure that you installed and imported it on top of the file:
import _ from 'lodash';
or just use Javascript function:
isSelected(date: moment.Moment): boolean {
return this.selectedDates.findIndex((selectedDate) => {
return moment(date).isSame(selectedDate.mDate, 'day');
});
}
Solution 2
You are calling findIndex
method of _. You are either using UnderscoreJS
or Lodash
.
As the error says WEBPACK_IMPORTED_MODULE_2_lodash.findIndex is not a function It means you are using lodash.
Import lodash library and it will work.
import _ from 'lodash';
Solution 3
selectedDate = arrayName.find(item => item.date === searchingdate);
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Vishwa
Updated on June 04, 2022Comments
-
Vishwa over 1 year
I'm very new to Angular 4 development. I encounter
someArray.findIndex()
is not a function. How to add this.findIndex()
javascript function in TypeScript.I'm building a calendar component, following function gives me error
WEBPACK_IMPORTED_MODULE_2_lodash.findIndex is not a function at CalendarComponent.isSelected (calendar.component.ts:4
isSelected(date: moment.Moment): boolean { return _.findIndex(this.selectedDates, (selectedDate) => { return moment(date).isSame(selectedDate.mDate, 'day'); }) > -1; }
Thank you so much.
-
Vishwa over 5 yearsThank you so much for your answer. This solved my problem. I've missed to install the
lodash
module.