codejump
EasyJavaScriptTypeScript

Union & Literal Types — Direction & Status

TypeScriptTypesUnions

Use literal types and union types to build a small routing helper.

Implement solve(direction, speed) where:

  • direction is one of: "north" | "south" | "east" | "west"
  • speed is one of: "slow" | "fast"
  • Returns a string: "{direction} at {speed} speed"

Also implement isCardinal(direction) which returns true if the direction is one of the four cardinal directions, false otherwise.

Examples

  • solve("north", "fast") → "north at fast speed"
  • isCardinal("north") → true
  • isCardinal("diagonal") → false

Sample tests

Test #1solve — north fast
Input: ["solve","north","fast"]
Output: "north at fast speed"
Test #2solve — west slow
Input: ["solve","west","slow"]
Output: "west at slow speed"
Test #3isCardinal — north is cardinal
Input: ["isCardinal","north"]
Output: true
Test #4isCardinal — diagonal is not cardinal
Input: ["isCardinal","diagonal"]
Output: false
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