Loops/Increment loop index within loop body: Difference between revisions
Loops/Increment loop index within loop body (view source)
Revision as of 07:54, 23 August 2021
, 2 years ago→{{header|jq}}
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Same as Kotlin entry
</pre>
=={{header|jq}}==
{{works with|jq}}
'''Works with gojq, the Go implementation of jq'''
jq's looping constructs that have a loop index do not allow that index to be modified within the loop
as such indices are "read-only", but all the looping constructs allow an index to be
be defined and modified, as illustrated by the following example, which uses "i" as the loop index.
This entry uses the jq implementation of is_prime as shown at
[[Erd%C5%91s-primes#jq]].
<lang jq>{i:42, count:0}
| while( .count <= 42;
.emit = null
| .i += 1
| if .i|is_prime
then
.count += 1
| .emit = "count at \(.i) is \(.count)"
| .i = .i + .i - 1
else .
end )
| select(.emit).emit</lang>
{{out}}
<pre>
count at 43 is 1
count at 89 is 2
count at 179 is 3
count at 359 is 4
count at 719 is 5
count at 1439 is 6
count at 2879 is 7
count at 5779 is 8
count at 11579 is 9
count at 23159 is 10
count at 46327 is 11
count at 92657 is 12
count at 185323 is 13
count at 370661 is 14
count at 741337 is 15
count at 1482707 is 16
count at 2965421 is 17
count at 5930887 is 18
count at 11861791 is 19
count at 23723597 is 20
count at 47447201 is 21
count at 94894427 is 22
count at 189788857 is 23
count at 379577741 is 24
count at 759155483 is 25
count at 1518310967 is 26
count at 3036621941 is 27
count at 6073243889 is 28
count at 12146487779 is 29
count at 24292975649 is 30
count at 48585951311 is 31
count at 97171902629 is 32
count at 194343805267 is 33
count at 388687610539 is 34
count at 777375221081 is 35
count at 1554750442183 is 36
count at 3109500884389 is 37
count at 6219001768781 is 38
count at 12438003537571 is 39
count at 24876007075181 is 40
count at 49752014150467 is 41
count at 99504028301131 is 42
</pre>
=={{header|Julia}}==
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