js find all indexes in array code example

Example 1: react-native array.filter by index arrow function

_onHandleRemoveSubmittedPicture = async (i, pictureindex) => {
	console.log('_onHandleRemoveSubmittedPicture: Entering Function');
	console.log('_onHandleRemoveSubmittedPicture: index passed in is: ', pictureindex);
//
// in react-native, removing an item from an array. SelectedStoryPhotos is the array name, remember item is the array item, index is it's position in the arry, picture
// index is the index of the array item you want removed passed in.
// 
	this.setState(state => {
		const selectedStoryPhotos = state.selectedStoryPhotos.filter((item, index) => pictureindex !== index);
		return {selectedStoryPhotos,
		};
	});
	console.log('_onHandleRemoveSubmittedPicture: selectedStoryPhotos after removal of index',pictureindex,'array = ',this.state.selectedStoryPhotos);
}

Example 2: javascript get index of object in array

// Get index of object with specific value in array
const needle = 3;
const haystack = [{ id: 1 }, { id: 2 }, { id: 3 }];
const index = haystack.findIndex(item => item.id === needle);