Every example has PL/SQL in comments and corresponding JS UDF uncommented.

With Couchbase Javascript N1QL UDFS, Its a 4 step process: 
1.Write the UDF in Javascript.This UDF can include zero or more N1QL statements. 
2.Register the UDF into a library using curl or UI
3.Create mapping N1QL functions using CREATE FUNCTION in cbq or UI 
4.Execute the N1QL functions.

Using either UI or REST API
Create a bucket test
curl -X POST -u Administrator:password -d name=test -d ramQuotaMB=2048 -d authType=none http://127.0.0.1:8091/pools/default/buckets -d threadsNumber=8 -d replicaNumber=0

Using either UI query editor or cbq, create scope within the bucket test and then create collections
These collections will be needed in examples.

create scope test.testscope;
create collection test.testscope.temp;
create collection test.testscope.emp;
create collection test.testscope.temp1;
create collection test.testscope.exam3;
create collection test.testscope.departments;
create collection test.testscope.employees;
create collection test.testscope.emp8;

Create primary indexes in UI or cbq
CREATE PRIMARY INDEX ON `default`:`test`.`testscope`.`temp`
CREATE PRIMARY INDEX ON `default`:`test`.`testscope`.`emp`;
CREATE PRIMARY INDEX ON `default`:`test`.`testscope`.`temp1`;
CREATE PRIMARY INDEX ON `default`:`test`.`testscope`.`exam3`;
CREATE PRIMARY INDEX ON `default`:`test`.`testscope`.`departments`;
CREATE PRIMARY INDEX ON `default`:`test`.`testscope`.`employees`;
CREATE PRIMARY INDEX ON `default`:`test`.`testscope`.`emp8`;


For example 1:
curl -s -k -X POST http://localhost:8093/evaluator/v1/libraries/udftestlib -u Administrator:password --data-binary @./example1.js

In cbq:
CREATE OR REPLACE FUNCTION forloop() LANGUAGE JAVASCRIPT AS "forloop" AT "udftestlib";
execute function forloop();

Example 2:
curl -s -k -X POST http://localhost:8093/evaluator/v1/libraries/udftestlib2 -u Administrator:password --data-binary @./example2.js

In cbq:
CREATE OR REPLACE FUNCTION insertdata() LANGUAGE JAVASCRIPT AS "insertdata" AT "udftestlib2";
execute function insertdata();
CREATE OR REPLACE FUNCTION alternatetocursor() LANGUAGE JAVASCRIPT AS "alternatetocursor" AT "udftestlib2";
execute function alternatetocursor();
select * from test.testscope.temp1;

Example 3:
curl -s -k -X POST http://localhost:8093/evaluator/v1/libraries/udftestlib3 -u Administrator:password --data-binary @./example3.js

In cbq:
CREATE OR REPLACE FUNCTION scoping() LANGUAGE JAVASCRIPT AS "scoping" AT "udftestlib3";
execute function scoping();
select * from test.testscope.exam3 ;

Example 5:
curl -s -k -X POST http://localhost:8093/evaluator/v1/libraries/udftestlib5 -u Administrator:password --data-binary @./example5.js

In cbq:
CREATE OR REPLACE FUNCTION salaryupdate() LANGUAGE JAVASCRIPT AS "salaryupdate" AT "udftestlib5";
execute function salaryupdate();

Example 7:
curl -s -k -X POST http://localhost:8093/evaluator/v1/libraries/udftestlib7 -u Administrator:password --data-binary @./example7.js

In cbq:
CREATE OR REPLACE FUNCTION exampleforinnerjoin() LANGUAGE JAVASCRIPT AS "exampleforinnerjoin" AT "udftestlib7";
 execute function exampleforinnerjoin();

Example 8:
curl -s -k -X POST http://localhost:8093/evaluator/v1/libraries/udftestlib8 -u Administrator:password --data-binary @./example8.js

CREATE OR REPLACE FUNCTION insertdata() LANGUAGE JAVASCRIPT AS "insertdata" AT "udftestlib8" ;
CREATE OR REPLACE FUNCTION totalEmployees() LANGUAGE JAVASCRIPT AS "totalEmployees" AT "udftestlib8" ;
execute function insertdata();
SELECT count(*) FROM test.testscope.emp8;

Example 9:
curl -v -X POST http://localhost:8093/evaluator/v1/libraries/libfact -u Administrator:password –data-binary '@example9.js'

CREATE FUNCTION fact(x) LANGUAGE javascript AS "fact" at "libfact"
execute function fact(3);
execute function fact(0.5);

Example elapsed_time_calculator:
curl -v -X POST http://localhost:8093/evaluator/v1/libraries/elapsed_time_calculator -u Administrator:password --data-binary @./elapsed_time_calculator.js

CREATE OR REPLACE FUNCTION calculate_elapsed_time() LANGUAGE JAVASCRIPT AS "calculate_elapsed_time" AT "elapsed_time_calculator";
EXECUTE FUNCTION calculate_elapsed_time();