BrowserStack Interview 2014

Attempt the following question in a maximum of 5 hours

IIT Roorkee

Question 1

Tree with grep support

The program will be given a folder named (optional, if not passed assume cwd). The program will print something like this:

$ tree
.
|-- README.md
|-- closure
|   |-- currencySymbols.js
|   |-- datetimeSymbolsExt.js
|   |-- datetimesymbols.js
|   |-- numberSymbols.js
|   `-- pluralRules.js
|-- e2e
|   |-- i18n-e2e.js
|   |-- localeTest_cs.html
|   |-- localeTest_de.html
|   |-- localeTest_en.html
|   |-- localeTest_es.html
|   |-- localeTest_sk.html
|   |-- localeTest_zh.html
|   `-- runner.html
|-- generate.sh
|-- run-tests.sh
|-- spec
|   |-- closureI18nExtractorSpec.js
|   |-- converterSpec.js
|   |-- parserSpec.js
|   `-- utilSpec.js
|-- src
|   |-- closureI18nExtractor.js
|   |-- closureSlurper.js
|   |-- converter.js
|   |-- parser.js
|   `-- util.js
`-- update-closure.sh

4 directories, 26 files

An optional second parameter supports filtering the tree with grep like filter, only matching nodes. Eg:

$ tree . src
.
`-- src
    |-- closureI18nExtractor.js
    |-- closureSlurper.js
    |-- converter.js
    |-- parser.js
    `-- util.js
It should be possible to use arbitrary regex expression for filtering.

Question 2

Write a Key Server which is capable of accepting three calls: /generate, /validate and /delete.

The /validate and /delete accept a single http parameter "key" each, and return the response in plain-text.
Once generated a key is valid for only 60 seconds.

Output:
/generate call:
{NEW_KEY}

/validate call:
Response for valid key:
{KEY}:VALID

Response for invalid key:
{KEY}:INVALID

/delete call:
{KEY}:DELETED

IIT Delhi

Question 1

You will need to poll an HTTP endpoint (provided to you) and log the response code in a log file, with the date and corresponding response code. In case of error response code, the date and response code should be pushed to a UDP server in same format as logged in the file.

Health check URL should be configurable via a command line argument.
Ex: ./monitor http://www.google.com/

File log format:
Date: Fri Oct 28 18:59:24 IST 2014 Response: 200

Error push format:
Date: Fri Oct 28 18:59:24 IST 2014 Response: 500

Question 2

Program a UDP server that reads string data in following format:
Kind: “valid", Data: "Awesome Data"
Kind: “invalid", Data: "Bad Data"

If "Kind" is equal to "valid" you accept and push the data in the valid.log file, otherwise push into the invalid.log file.

Note: 

You are free to use the Internet to research the problems. In case you face any issues, please don't hesitate to ask.

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