How should I practice Validate Six-Column Business CSV Rows?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Stripe phone screen problems in FastPrep.

Is Validate Six-Column Business CSV Rows associated with Stripe?

FastPrep tags this as a Stripe phone screen coding practice problem when the problem catalog has that company and stage context.

Validate Six-Column Business CSV Rows

Stripe● MediumFULLTIMENEW GRADPHONE SCREEN

Learn

Problem statement

rows[0] is a six-column header. Validate every later comma-separated row and return one label per data row. Fields do not contain commas, quoting, or escapes.

Apply these rules in order and report only the first failure:

RULE_1: exactly six trimmed fields, each nonempty.
RULE_2: the trimmed fifth field has length from 5 through 31 inclusive.
RULE_3: no whitespace token in the second field is a case-insensitive member of forbiddenWords.
RULE_4: remove case-insensitive ignoreWords from the distinct lowercase whitespace tokens of field two. At least half of the remaining words, rounded up, must appear in the distinct lowercase non-ignored tokens of field four or field five. If no word remains from field two, this rule fails.

Return VALID or INVALID:RULE_X.

Function

validateBusinessRows(rows: String[], forbiddenWords: String[], ignoreWords: String[]) → String[]

Examples

Example 1

rows = ["id,name,type,description,code,status","1,Acme LLC,vendor,Acme services,12345,active","2,Bad Corp,vendor,Other,12345,active"]forbiddenWords = ["bad"]ignoreWords = ["llc","corp"]return = ["VALID","INVALID:RULE_3"]

The first row has an overlapping word after ignoring LLC; the second fails the forbidden-word rule first.

Example 2

rows = ["h1,h2,h3,h4,h5,h6","1,Alpha Beta,x,beta market,alpha,ok","1,Alpha Beta,x,none,alpha,ok","1,,x,a,12345,ok"]forbiddenWords = []ignoreWords = []return = ["VALID","VALID","INVALID:RULE_1"]

Rules are checked in order, and both valid rows meet the one-of-two overlap threshold.

Example 3

rows = ["a,b,c,d,e,f","1,LLC LLC,x,llc,llc12,ok"]forbiddenWords = []ignoreWords = ["llc"]return = ["INVALID:RULE_4"]

A second field with no non-ignored word fails rule four.

Constraints

2 <= rows.length <= 100000.
The header has exactly six comma-separated fields.
Each row and word-list entry has at most 1000 characters.
The combined input length is at most 2 * 10^6.