Infosys SP / DSE Placement Simulation

Member discount crashes with ReferenceError

finalPrice(price, isMember) gives members 10% off and returns the price to pay. Example: finalPrice(100, true) → 90, finalPrice(100, false) → 100.

Flattening stops after one level

flattenDeep(arr) removes all nesting, however deep. Example: flattenDeep([1, [2, [3, [4]]]]) → [1, 2, 3, 4].

Grouping words keeps only one per group

groupByLength(words) groups words by their length. Example: groupByLength(["ab", "cd", "x"]) → { 1: ["x"], 2: ["ab", "cd"] }.

Removing duplicates never finishes

dedupe(arr) returns the array without duplicates, keeping the first copy of each value. Example: dedupe([1, 2, 2, 3]) → [1, 2, 3].

Search freezes when the value is missing

indexOfValue(sorted, target) returns the index of target in a sorted array, or -1 if it is not there. Example: indexOfValue([1, 3, 5, 7], 4) → -1.

Two identical records counted as different

countUnique(records) counts records with different contents. Two records with the same fields count once. Example: countUnique([{ id: 1 }, { id: 1 }]) → 1.

0.1 + 0.2 gives 0.30000000000000004

addPrices(a, b) adds two prices and returns a result correct to the cent. Example: addPrices(0.1, 0.2) → 0.3.

Type checker says null is an object

describeType(value) names the type of a value. It returns "null" for null and "object" for real objects. Example: describeType(null) → "null".

Setting retries to 0 turns them back on

retriesFor(settings) returns settings.retries if it is set, or 3 if it is missing. 0 means "don't retry". Example: retriesFor({ retries: 0 }) → 0, retriesFor({}) → 3.

Binary search can't find the last item

binary_search(nums, target) returns the index of target in a sorted list, or -1 if it is not there. Example: binary_search([1, 3, 5, 7, 9], 9) → 4.

Best window of 2 misses the last pair

max_window_sum(nums, k) returns the biggest sum of k numbers in a row. Example: max_window_sum([1, 2, 3, 10], 2) → 13 (3 + 10).

Counting pairs freezes when a pass finds none

count_pairs(nums, target) counts the pairs of numbers that add up to target. Example: count_pairs([1, 2, 3], 5) → 1 (2 + 3).

Leave calculator counts one day short

leave_days(start_iso, end_iso) counts the days of leave, including the first and last day. Example: leave_days("2024-01-01", "2024-01-07") → 7.

Search gives up after checking one item

contains(items, target) returns True if target is anywhere in the list. Example: contains([4, 8, 15], 8) → True.

Settings lookup crashes on a missing key

get_setting(config, key) returns the value for key, or "default" if the key is not there. Example: get_setting({"theme": "dark"}, "font") → "default".

Sorted name list comes back as None

sorted_names(names) returns the names in A to Z order. Example: sorted_names(["b", "a"]) → ["a", "b"].

Adding a tag makes the whole list disappear

add_tag(tags, new_tag) adds a tag to the list and returns the list. Example: add_tag(["python"], "debugging") → ["python", "debugging"].

Shopping total crashes at the end of the list

cart_total(prices) adds up every price. Example: cart_total([10, 20, 30]) → 60.