freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/comparisons-with-the-logical-and-operator.english.md

id, title, challengeType, videoUrl, forumTopicId

id	title	challengeType	videoUrl	forumTopicId
56533eb9ac21ba0edf2244d8	Comparisons with the Logical And Operator	1	https://scrimba.com/c/cvbRVtr	16799

Description

Sometimes you will need to test more than one thing at a time. The logical and operator (&&) returns true if and only if the operands to the left and right of it are true. The same effect could be achieved by nesting an if statement inside another if:

if (num > 5) {
  if (num < 10) {
    return "Yes";
  }
}
return "No";

will only return "Yes" if num is greater than 5 and less than 10. The same logic can be written as:

if (num > 5 && num < 10) {
  return "Yes";
}
return "No";

Instructions

Replace the two if statements with one statement, using the && operator, which will return "Yes" if val is less than or equal to 50 and greater than or equal to 25. Otherwise, will return "No".

Tests

tests:
  - text: You should use the <code>&&</code> operator once
    testString: assert(code.match(/&&/g).length === 1);
  - text: You should only have one <code>if</code> statement
    testString: assert(code.match(/if/g).length === 1);
  - text: <code>testLogicalAnd(0)</code> should return "No"
    testString: assert(testLogicalAnd(0) === "No");
  - text: <code>testLogicalAnd(24)</code> should return "No"
    testString: assert(testLogicalAnd(24) === "No");
  - text: <code>testLogicalAnd(25)</code> should return "Yes"
    testString: assert(testLogicalAnd(25) === "Yes");
  - text: <code>testLogicalAnd(30)</code> should return "Yes"
    testString: assert(testLogicalAnd(30) === "Yes");
  - text: <code>testLogicalAnd(50)</code> should return "Yes"
    testString: assert(testLogicalAnd(50) === "Yes");
  - text: <code>testLogicalAnd(51)</code> should return "No"
    testString: assert(testLogicalAnd(51) === "No");
  - text: <code>testLogicalAnd(75)</code> should return "No"
    testString: assert(testLogicalAnd(75) === "No");
  - text: <code>testLogicalAnd(80)</code> should return "No"
    testString: assert(testLogicalAnd(80) === "No");

Challenge Seed

function testLogicalAnd(val) {
  // Only change code below this line

  if (val) {
    if (val) {
      return "Yes";
    }
  }

  // Only change code above this line
  return "No";
}

testLogicalAnd(10);

Solution

function testLogicalAnd(val) {
  if (val >= 25 && val <= 50) {
    return "Yes";
  }
  return "No";
}