- 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
- Define a function named isFalse that takes in a value and returns true if and only if the argument provided false.
isFalse(false) // true
isFalse(true) // false
isFalse(0) // false
isFalse(null) // false
isFalse("") // false
isFalse("Banana") // false
isFalse([1, 2]) // false
- 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
- 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
- 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
- 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
- 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
- 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!)
- 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)
- 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"