 # Code Efficiency: Any Quick Way to Determine?

Hello,
I was wondering if anyone can tell me if there’s any way to calculate/determine how efficient/not efficient one’s code is. In the following code below, which is my noob-solution to the “Smallest Common Multiple” algorithm challenge, I assume that if I coded something like Euclidean’s algorithm into my code (I notated where I’m referring to below somewhere mid-way through the code) to determine the LCM of the numbers being checked, that the code would be more “efficient”. Actually, I assumed the code wouldn’t even work without figuring specific LCM’s but it did. The code passed but I feel a bit guilty about proceeding without something more “efficient”. Can someone explain how I, as a noob and not very naturally mathematically gifted, could determine the efficiency of one version of code vs. another version?

``````function smallestCommons(arr) {
if (arr > arr){                     //sorts array into ascending order
arr.push(arr.shift());
}
let aArr = arr;
let bArr = arr;
let betweenArr = [];
for (let i = aArr; i <= bArr;i++){ betweenArr.unshift(i)};//arr of numbers between a & b
console.log(betweenArr);
let a = betweenArr;
let b = betweenArr;

let lcm;
lcm = ((a*b)/b); // .  ** PERHAPS THIS COULD BE MORE PRECISELY DEFINED USING THE EUCLIDEAN ALGORITHM? **

let varPass;
let lcmControl = lcm; //keeps a static lcm value in order to add to lcm for tests
while (varPass = "not ok"){
for (let i = 0; i < betweenArr.length; i++){
if ((lcm % betweenArr[i]) != 0){
varPass = "not ok";
lcm += lcmControl;
}
}
}

console.log(lcm);
return lcm;

}
smallestCommons([23,18]);

``````

You should click the Get a Hint button located on the challenge to see other solutions and compare them to yours.

Your code has been blurred out to avoid spoiling a full working solution for other campers who may not yet want to see a complete solution.

If by “efficient” you mean performant/fast, you can empirically find out how performant your code is using tools like jsPerf. You can also compare the performance of your solution vs. other solutions. No math knowledge required.

1 Like

Exactly the sort of thing I was talking about! Thanks!