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only improved the Try all test cases online

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edited Aug 1, 2019 at 14:05

jq, 30 characters

group_by(.)|map(length==2)|all

Sample run:

bash-5.0$ jq 'group_by(.)|map(length==2)|all' <<< '[7,13,9,2,10,2,4,10,7,13,4,9]'
true

group_by(.)|map(length==2)|all

Sample run:

bash-5.0$ jq 'group_by(.)|map(length==2)|all' <<< '[7,13,9,2,10,2,4,10,7,13,4,9]'
true

group_by(.)|map(length==2)|all

Sample run:

bash-5.0$ jq 'group_by(.)|map(length==2)|all' <<< '[7,13,9,2,10,2,4,10,7,13,4,9]'
true

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created Aug 1, 2019 at 13:25

group_by(.)|map(length==2)|all

Sample run:

bash-5.0$ jq 'group_by(.)|map(length==2)|all' <<< '[7,13,9,2,10,2,4,10,7,13,4,9]'
true