str.indexOf(substr) == 0
str.slice(0, 10) == substr
Which one of the above two is better? Is there any better way?
str.indexOf(substr) == 0 str.slice(0, 10) == substr Which one of the above two is
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str.indexOf(substr) == 0
str.slice(0, 10) == substr
Which one of the above two is better? Is there any better way?
The performance of the first depends on the length of the string
stras it requires scanning the entire string. Ifstris large it could take a long time to find whether or not the substring is contained within it.If your input string could be large prefer the second.
Another option is:
This avoids scanning the entire string and avoids creating a temporary string.
If performance matters, I’d suggest measuring it for your specific data.