CODEWITHSUNDEEP
javascript
Kingle
Kingle

Reputation: 345

Should I assign the length of array to another variable in for loop?

I'm learning Javascript and the for loop here looks exactly the same as in C. What I'm wondering is whether I should assign the length of a string to another variable in the loop. I usually do that in C when looping over a char array so the loop does not have to call strlen with each iteration:

for (int i = 0, n = strlen(word); i < n; i++)
{
    // code block
}

What I see from following tutorials is that a for loop in Javascript is just written without assigning array length of a variable:

for (let i = 0; i < arr.length; i++) {
    // code block
}

Is there any advantage to assigning the length of the array to a variable in Javascript?

Upvotes: 3

Views: 560

Answers (1)

Robbie Milejczak
Robbie Milejczak

Reputation: 5770

No benefit, not as important as in C because arr.length is a static property i.e. it is not computed, unlike strlen which would compute the length each time it is called.

edit: see for yourself, its a controversial issue but it seems like accessing the property directly is fastest

Upvotes: 8

Related Questions