const 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);
ar = [1, 2, 3, 4]; ar = ar.filter(item => !(item > 3)); console.log(ar) // [1, 2, 3]