EN
JavaScript - do loops check the array.length every time when comparing i to array.length?
1 answers
0 points
Do normal loops check the array.length each time?
For example a simple for loop:
xxxxxxxxxx1
var i, length;2
3
for (i = 0, length = array.length; i < length; i++) {4
// ...5
} 1 answer
0 points
Yes, the length property of an array is checked at each enumeration when the loop is constructed as follows: for (var i = 0; i < array.length; ++i) (which is a shorthand for your implementation).
Explanation
The for loop consists of three parts which are executed as follows:
xxxxxxxxxx1
for (part1; part2; part3) {2
// ...3
}part1is executed before the enumeration,part2is a condition to test before each loop iteration,part3is an expression after each enumeration.
See also
References
0 commentsShow commentsAdd comment
