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ReactiveCocoa Programming on iOS pdf
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上传时间: 2017-09-02
详细说明： One of the key concepts of functional programming is that of a “higher-order function”. According to Wikipedia, a higher-order function is a function that satisfies these two conditions: • It takes one or more functions as input. • It outputs a function. In Obje ctive-C, we often use blocks as functions. We don’t have to look very far to find some higher-order functions baked into Foundation for us by Apple. Consider a simple array of numbers: 1 NSArray *array = @[@(1), @(2), @(3)]; We might want to enumerate over the contents of that array, doing something with each element. “Fine”, you say, “I’ll just write a for loop.” Stop right there, buddy. As I’ve written before, stop writing for loops. There is a higher-order function of NSArray’s that we can use, instead. This code: 1 for (NSNumber *number in array) { 2 NSLog(@"%@", number); 3 } … is equivalent to ...展开收缩
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