See

index.html

for test feedback

1. Define a function named

   isTrue

   that takes in any input and returns true if the input provided is exactly equal to true in value and boolean in data type.



isTrue(true)             // true

isTrue(false)            // false

isTrue(0)                // false

isTrue(null)             // false

isTrue("true")           // false

isTrue("Banana")         // false

isTrue([1, 2])           // false

2. Define a function named isFalse that takes in a value and returns a boolean if the argument provided is a boolean value or not.

isFalse(false)             // true

isFalse(true)              // false

isFalse(0)                 // false

isFalse(null)              // false

isFalse("")                // false

isFalse("Banana")          // false

isFalse([1, 2])            // false

3. Define a function named not that takes in any input and returns the boolean opposite of the provided input.

not(false)                  // true

not(0)                      // true

not("")                     // true

not(null)                   // true

not(NaN)                    // true

not(undefined)              // true

not(true)                   // false

not("something")            // false

not(Infinity)               // false

not(123)                    // false

4. Define a function named addOne that takes in a single input. If the input is a number or a numeric string, return the value plus one.

addOne(0)                    // 1

addOne(2)                    // 3

addOne(-5)                   // -4 

addOne(5.789)                // 6.789

addOne(Infinity)             // Infinity

addOne("2")                  // 3

addOne("0")                  // 1

addOne("banana")             // NaN

addOne(true)                 // NaN

addOne(NaN)                  // NaN

5. Define a function named isEven that takes in a single input. If the input is an even number or a string containing an even number, return true. Any other input should return false for the output.

isEven(2)                   // true

isEven(-8)                  // true

isEven(0)                   // true

isEven("42")                // true

isEven(1)                   // false

isEven("-3")                // false

isEven(false)               // false

isEven("banana")            // false

6. Define a function named isIdentical that takes in two input arguments. If each input is equal both in data type and in value, then return true. If the values are not the same data type or not the same value, return false.

isIdentical(3, 3)                     // true

isIdentical(false, false)             // true

isIdentical("hello", "hello")         // true

isIdentical(3, 3.0)                   // true

isIdentical(undefined, undefined)     // true

isIdentical(2, "2")                   // false

isIdentical("javascript", "java")     // false

7. Define a function named isEqual that takes in two input arguments. If each argument is equal only in value, then return true. Otherwise return false.

isEqual(3, "3")                       // true

isEqual("abc123", "abc123")           // true

isEqual(true, 1)                      // true

isEqual(0, false)                     // true

isEqual(4, -5)                        // false

isEqual("java", "javascript")         // false

8. Define a function named or that takes in two input arguments. The output returned should be the result of an or operation on both inputs.

or(true, true)                    // true

or(true, false)                   // true

or(false, true)                   // true

or(false, false)                  // false

or("hello", "world")              // "hello" (this behavior is non-obvious, research more!)

9. Define a function named and that takes in two input arguments and returns the result of a logical and operation of both inputs.

and(true, true)                    // true

and(true, false)                   // false

and(false, true)                   // false

and(false, false)                  // false

and("hello", "world")              // "world" (this behavior is non-obvious, research more)

10. Define a function named concat that takes in two input arguments. If both arguments are strings, then return the concatenated result. If two numbers are provided, then return the string concatenation of each set of numerals.

concat("code", "up")                // "codeup"

concat("connect", 4)                // "connect4"

concat("hello", "world")            // "helloworld"

concat(4, 2)                        // "42"

concat(true, true)                  // "truetrue"