Introduction
Slacher Flick is a coding challenge in which we will be given a function with two arguments: the first one is an Array, while the second one is a Number. Our task is to remove elements from the beginning of the array until the index equals the given number. For example, if our Array is [3, 3, 2, 4], and the Number is 3, the output will be [4] because we will remove elements from index 0 to up to index 3, which is equal to the given Number.
Although this challenge is simple, understanding it is crucial—it may appear in coding interviews! It can be solved in multiple programming languages, but we'll use JavaScript for our solution.
Examples:
let array = [1, 2, 3, 5, 6, 8];
let number = 2;
// Output: [3, 5, 6, 8]
let array = [3, 3, 2, 4];
let number = 3;
// Output: [4]Now that you understand the challenge, let's explore the solution.
Solution:
function slasher(arr, howMany) {
return arr.slice(howMany);
}
console.log(slasher([3,3,2,4],3))
// Output: [4]Breaking Down the Solution:
Have you seen how easy it is to solve this? Let's break down this simple problem to make it even simpler.
This function named slasher takes two arguments:
- arr → The input array ([3, 3, 2, 4]).
- howMany → The number indicating how many elements to remove (3).
Inside the function, we use: arr.slice(howMany) → This removes elements from the beginning up to the specified index.
Understanding the slice() Method:
The slice() method is a built-in JavaScript function used to extract a portion of an array without modifying the original one.
Key Points About slice()
- It takes two arguments: slice(start, end).
- The starting index defines where extraction begins.
- The ending index is exclusive (meaning it stops before this index).
- If only one argument is provided (slice(x)), it removes everything up to index x.
In this case, we only need elements from index howMany to the end of the array.