object-c in_array

判断的三种方式：

//
//  main.m
//  learning
//
//  Created by xiaozi on 13-12-8.
//  Copyright (c) 2013年 xiaozi. All rights reserved.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        
        NSString* extsStr = @"php,js,py";
        NSArray* extsArr = [extsStr componentsSeparatedByString:@","];
        
        // 是否在数组中 {{{
        NSPredicate* rule1 = [NSPredicate predicateWithFormat:@"SELF IN %@", extsArr];
        BOOL result1 = [rule1 evaluateWithObject:@"txt"];
        NSLog(@"%d", result1);
        // }}}
        
        // {{{
        NSPredicate* rule2 = [NSPredicate predicateWithFormat:@"SELF CONTAINS %@", @"js"];
        
        // 数组包含
        BOOL result2 = [rule2 evaluateWithObject:extsArr];
        NSLog(@"%d", result2);
        // }}}
        
        // 数组过滤
        BOOL result3 = [[extsArr filteredArrayUsingPredicate:rule2] count];
        NSLog(@"%d", result3);
        
    }
    return 0;
}