Add prefer-array-some rule

[fisker]

Fixes #736

[sindresorhus]

Is it possible to add autofixing?

[fisker]

Is it possible to add autofixing?

It's possible, but not safe.

const array = [""]

// find `""`, falsely
if (array.find(element => typeof element !== 'number'));

// true
if (array.some(element => typeof element !== 'number'));

[fisker]

Note to my self, forgot negative test

if (!foo.find(fn)){}

[fisker]

After a second thought, this rule, should not related to if nor ternary, it should be any expression returns a boolean.

const foo = !array.find(element => element === foo);

Should be reported too.

The same thing is missing in explicit-length-check rule.

And it seems hard to implement.

Maybe I'll use some logic from explicit-length-check , so we can check if (!foo.find(fn)){} if (foo.find(fn) || bar){} etc

[fisker]

Ready for review.

[sindresorhus]

Nice! I really like how simple the rule logic is because it's just using a reusable utility. 👍🏻