The "Truthy" Checker

Write a function isTruthy(value) that takes any value.

• It should return true if the value is truthy.

• It should return false if the value is falsy.

Constraint: You cannot use an if statement.

Test Cases:

• isTruthy("hello") should return true

• isTruthy(42) should return true

• isTruthy(true) should return true

• isTruthy("") should return false

• isTruthy(0) should return false

• isTruthy(undefined) should return false

💡 The 'Syntax Nudge'

This is the classic use case for the double bang (!!) operator. How can you use it to "normalize" the input value into its pure boolean form?

If ! means "take this value, find its truthiness, and flip it," then !! simply means "do that twice."

• !!value = !(!value)

Why on earth would you do this? It's used to normalize any value into a "pure" boolean. It's a very common way to answer the question, "Does this value have anything in it?"

Let's trace it with "hello":

1. !"hello" (truthy) becomes false

2. !false (the second !) becomes true So, !!"hello" = true

Let's trace it with 0:

1. !0 (falsy) becomes true

2. !true (the second !) becomes false So, !!0 = false

The !! operator is a concise way of forcing any value to its simple true or false equivalent.