1-get-angle-type.js

// Implement a function getAngleType
//
// When given an angle in degrees, it should return a string indicating the type of angle:
// - "Acute angle" for angles greater than 0° and less than 90°
// - "Right angle" for exactly 90°
// - "Obtuse angle" for angles greater than 90° and less than 180°
// - "Straight angle" for exactly 180°
// - "Reflex angle" for angles greater than 180° and less than 360°
// - "Invalid angle" for angles outside the valid range.

// Assumption: The parameter is a valid number. (You do not need to handle non-numeric inputs.)

// Acceptance criteria:
// After you have implemented the function, write tests to cover all the cases, and
// execute the code to ensure all tests pass.

function getAngleType(angle) {
  if ((angle > 0) & (angle < 90)) {
    return "acute angle";
  } else if (angle == 90) {
    return "right angle";
  } else if (angle > 90 && angle < 180) {
    return "obtuse angle";
  } else if (angle == 180) {
    return "straight angle";
  } else if (angle > 180 && angle < 360) {
    return "reflex angle";
  } else {
    return "invalid angle";
  }
}

// The line below allows us to load the getAngleType function into tests in other files.
// This will be useful in the "rewrite tests with jest" step.
module.exports = getAngleType;

// This helper function is written to make our assertions easier to read.
// If the actual output matches the target output, the test will pass
function assertEquals(actualOutput, targetOutput) {
  console.assert(
    actualOutput === targetOutput,
    `Expected ${actualOutput} to equal ${targetOutput}`
  );
}

// TODO: Write tests to cover all cases, including boundary and invalid cases.
// Example: Identify Right Angles
const right = getAngleType(90);
assertEquals(right, "Right angle");

// Identify acute Angles
const acute = getAngleType(60);
assertEquals(acute, "acute angle");

// Identify obtuse Angles
const obtuse = getAngleType(120);
assertEquals(obtuse, "obtuse angle");

// Identify straight Angles
const straight = getAngleType(180);
assertEquals(straight, "straight angle");

// Identify reflex Angles
const reflex = getAngleType(250);
assertEquals(reflex, "reflex angle");

// Identify invalid Angles
const invalid = getAngleType(0);
assertEquals(invalid, "invalid angle");

const invalid = getAngleType(360);
assertEquals(invalid, "invalid angle");

const invalid = getAngleType(-100);
assertEquals(invalid, "invalid angle");

const invalid = getAngleType(1000);
assertEquals(invalid, "invalid angle");