NSString.split(@"") works

It is logical that splitting by nothing will split by the smallest possible unit, ie. nothing, so all characters are split out into an array.

Though, no other framework does this. It's often something I've expected and sometimes: needed.

NSString+YOLO.m

@@ -5,7 +5,14 @@ @implementation NSString (YOLO)
 
 - (NSArray *(^)(NSString *))split {
     return ^NSArray *(NSString *separator){
-        return [self componentsSeparatedByString:separator];
+        if (separator.length == 0) {
+            const NSUInteger N = self.length;
+            id chars[N];
+            for (NSUInteger x = 0; x < N; ++x)
+                chars[x] = [self substringWithRange:NSMakeRange(x, 1)];
+            return [NSArray arrayWithObjects:chars count:N];
+        } else
+            return [self componentsSeparatedByString:separator];
     };
 }
 

README.markdown

@@ -546,7 +546,9 @@ id rv = @1.upTo(6);
 ###NSString.split()
 ```objc
 id rv = @"1,2,3,4,5,6".split(@",");
+// rv => @[@"1", @"2", @"3", @"4", @"5", @"6"]
 
+id rv = @"123456".split(@"");
 // rv => @[@"1", @"2", @"3", @"4", @"5", @"6"]
 ```
 

tests

@@ -281,6 +281,10 @@ int main() {
     id aa = @"1,2,3,4".split(@",");
     id bb = @[@"1", @"2", @"3", @"4"];
     XCTAssertEqualObjects(aa, bb);
+
+    aa = @"1234".split(@"");
+    bb = @[@"1", @"2", @"3", @"4"];
+    XCTAssertEqualObjects(aa, bb);
 }
 
 - (NSArray *)array:(NSUInteger)count {