Object-c Comparison of various collection traversal efficiency

Objective:

For iOS project development always meet a variety of collection traversal, out of curiosity about the various traversal efficiency, so prepare to write a test program test

First: Declare a nsmutablearray, the amount of test data is 1000, 10,000, 100,000.

int Testmaxcount =+; // 10000,100000   *testarray= for (int i =0; i<testmaxcount; i++) {[              Testarray addobject:@ "test"];}    

First type: normal for loop

   // normal for Loop = cfabsolutetimegetcurrent ();                   for (int i =0; I<[testarray count];i++) {        NSLog (@ "%@")  , Testarray[i]);    }         = cfabsolutetimegetcurrent ();    NSLog (@ "  normal for loop time cost:%0.3f", End-start);

Second type: for In loop

  // For in Loop    Start = cfabsolutetimegetcurrent ();          for inch Testarray) {        NSLog (@ "%@", TempStr);    }         = cfabsolutetimegetcurrent ();    NSLog (@ " for In loop time cost :%0.3f", End-start);

Third Type: code block loop

// code block    Start = cfabsolutetimegetcurrent ();    [Testarray enumerateobjectsusingblock:^ (id  _nonnull obj, Nsuinteger idx, BOOL * _nonnull stop) { C8/>nslog (@ "%@", obj);            }];     = cfabsolutetimegetcurrent ();    NSLog (@ " code block cycle time Cost:%0.3f", End-start);

Fourth Type: Enumerator loop

  // Enumerator    Start = cfabsolutetimegetcurrent ();     *enumerator=[Testarray objectenumerator];      while (enumerator.nextobject) {        NSLog (@ "%@", Enumerator.nextobject );    }     = cfabsolutetimegetcurrent ();    NSLog (@ " Enumerator cycle time cost:%0.3f", End-start);

Execution Result:

1. Test Data 1000 Article 10,000 article 100,000 article

Normal for loop:0.391 2.390 18.400

For-in cycle:0.226 2.782 15.172

code block loop:0.241 2.744 15.123

Enumerator loop:0.147 1.429 7.432

Conclusion: The most rapid traversal is that the enumerator traverses the other three kinds of traversal efficiency.

Object-c Comparison of various collection traversal efficiency