How to alter this loop, so that it runs for i = 12, 18, 24, 30 and 36 only?
for (var i = 12; i < 36; i++) {
console.log(i);
}
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4 Answers
for (var i = 12; i <= 36; i += 6) {
console.log(i);
}
Comments
The i++ in the for statement is what to do before the next iteration of the loop. So in the case of i++ we're incrementing the variable i by one. So if you want to increment by six then you need to add 6 to the variable which will give you:
for (var i = 12; i < 36; i += 6) {
console.log(i);
}
Next up, you want to include 36, so you need to change your condition (the bit of your loop that says i < 36) to include 36. This is really easy, you just need to change the "less than" to "less than or equal to" :
for (var i = 12; i <= 36; i += 6) {
console.log(i);
}
1 Comment
Felix Kling
@NewUser: Your inner
for loop has i <=20 as condition, but you are not increasing i in that inner loop. The inner loop will run forever which means the outer loop cannot increase i to terminate the inner loop.Instead of doing i++ in your loop, do i += 6. Like this:
for (var i = 12; i < 36; i += 6) {
console.log(i);
}
1 Comment
William Brendel
That will stop before printing 36.
Alternatively (though not necessarily better):
for(var i, values = [12, 18, 24, 30, 36]; i = values.shift();) {
console.log(i);
}
This shows that you do not need to have an increasing counter in a for loop.
1 Comment
Iladarsda
Interesting. For more complicated examples (without a pattern) could be useful.