// numbers array

const numsArr = [23, 45, 56, 78];

​

// get the element's index position

// if number is not present the method will return -1

const indexToDelete = numsArr.indexOf(100);

​

// remove the element from the array

// by passing index position as the first argument to the splice() method

// and the number of elements to delete from the index psotion as the second argument

// in our case wee need to delete only one element from the index psotion

​

// Also, check is the indexOf() mehtod returns -1

// if it returns -1 don't do the splice() opeartion

if (indexToDelete > -1) {

  numsArr.splice(indexToDelete, 1);

} else {

  console.log("element not found in the array");

}

​

console.log(numsArr); // [23, 45, 56, 78]