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  1. process.stdin.resume();
  2. process.stdin.setEncoding('utf8');
  3.  
  4. var iters = 1000000;
  5. var withRegex = function( string ) {
  6.   return string.replace( /[^a-z0-9]/ig, '' );
  7. };
  8. var withRegex2 = function( string ) {
  9.   return string.replace( /[^a-z0-9]+/ig, '' );
  10. };
  11. var withPureJS = function( string ) {
  12.   var result = "";
  13.   var length = string.length;
  14.   for ( var pos = 0; pos < length; pos++ ) {
  15.     c = string.charCodeAt( pos );
  16.     if ( ( c > 47 && c < 58 ) || ( c > 64 && c < 91 ) || ( c > 96 && c < 123 ) ) {
  17.       result += string[pos];
  18.     };
  19.   };
  20.   return result;
  21. };
  22.  
  23. function test( func, string, iters ) {
  24.   var tStart = Date.now();
  25.   var etalon = withRegex( string );
  26.   for ( var i=0; i<iters; i++ ) {
  27.       if ( func( string ) != etalon ) {
  28.         console.log( "error" );
  29.         break;
  30.       };
  31.   };
  32.   var tEnd = Date.now();
  33.   console.log( "test "+counter, tEnd - tStart );
  34.   counter++;
  35. };
  36.  
  37. console.log( "Test started" );
  38. var counter = 1;
  39. test( withRegex, "abc0123$%^&*", iters );
  40. test( withRegex2, "abc0123$%^&*", iters );
  41. test( withPureJS, "abc0123$%^&*", iters );
Success #stdin #stdout 1.51s 52112KB
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stdin
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Standard input is empty
stdout
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Test started
test 1 503
test 2 461
test 3 400
https://ideone.com/juoJQr
language:
Node.js (node 11.12.0)
created:
8 years ago
visibility:
public

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