const index = array.indexOf(item); if (index > -1) { array.splice(index, 1); }
var index = array.indexOf(item); if (index !== -1) array.splice(index, 1);
const array = [2, 5, 9]; console.log(array); const index = array.indexOf(5); if (index > -1) { array.splice(index, 1); } // array = [2, 9] console.log(array);
const items = ['a', 'b', 'c', 'd', 'e', 'f'] const i = 2 const filteredItems = items.slice(0, i).concat(items.slice(i + 1, items.length)) // ["a", "b", "d", "e", "f"]