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$ curl repovive.com/roadmaps/javascript/control-flow/truthy-conditions

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$ curl repovive.com/roadmaps/javascript/control-flow/truthy-conditions

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Truthy Conditions - Control Flow | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

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Truthy Conditions

What counts as true

The condition doesn't have to be a boolean. JavaScript converts any value:

let username = "Alice"

if (username) {
  console.log(`Welcome, ${username}`)
}

This works because non-empty strings are truthy. Common patterns include:

if (array.length) { }  // Has items?
if (user) { }          // User exists?
if (count) { }         // Non-zero?

Remember the $6$ falsy values: false, 0, "", null, undefined, NaN.