Javascript: why not recommended to use `array.length` directly in if statements ？

[momodiy]

In NO. 15.3.

// bad
if (collection.length) {
  // ...
}

// good
if (collection.length > 0) {
  // ...
}

why use collection.length>0 is better than collection.length?

[ljharb]

Because .length isn't a boolean - which means you're relying on the implicit conversion of a number to a boolean. Using > 0 is explicit (and explicit > implicit), and avoids any possible confusion about what you mean.

[momodiy]

I see,thanks for your wonderful reply. @ljharb