swiftyobjc's Introduction

SwiftyObjC

let a = @"hello"; //a is `NSString *const` now
a = @"world"; //produces error

var b = 5; //b is `const int` now
b = 10; //fine

iflet(c, [self getNullableString]) {
    // c is not nil here
}
// c is not available here

ifletwhere(c, [self getNullableString], c.length > 5) {
    // can have additional constraints
}

Requirements

Xcode 8

Installation

SwiftyObjC is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'SwiftyObjC'

guard/guard let

They are possible but not implemented because it has two significant flaws:

I can't ensure else block has return/throw at compile time. Without this I find it too dangerous
I can't ensure one wrote else keyword, so again dangerous.

However, I'm looking forward to implement these, so if you found a way how to trick compiler, feel file a note or PR.

License

SwiftyObjC is available under the MIT license. See the LICENSE file for more info.

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iwill

swiftyobjc's Issues

iflet() is dangerous

It's a nice feature but consider this code:

for (int i = ...) {
    iflet (x, getValue(i)) {
        if (x->y > 10) continue;
        // Do something 
    }
    // Do something else
}

The programmer and reader expects the continue statement to continue the outer for-loop. But what it really does it continuing one of the hidden inner for-loops of iflet. This can lead to very annoying and hard to find bugs.

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