检查字符串中是否有任何单词在数组中

Question

I have a gigantic list (800 items) and one really long string. I want to get the first item in the array that matches the part of the string and stored in a variable.

My code currently:

for (var i = 0; i<gigantic_genre_array.length; i++) {
  var test_genre = thelongstr.indexOf(gigantic_genre_array[i]);
  if(test_genre != -1) {
    tag1 = gigantic_genre_array[test_genre];
    alert(tag1);
  }
}

This doesn't work like I thought it would, any suggestions?

Answer 1

Try this:

for(var i = 0; i<gigantic_genre_array.length; i++){
          var test_genre = thelongstr.indexOf(gigantic_genre_array[i]);
          if(test_genre!=-1){
            tag1 = gigantic_genre_array[i];
            alert(tag1);
          }
        }

Answer 2

Do the process reversely it will be efficient too.

var wordArray = thelongstr.split(' ');

for(var i=0,len = wordArray.length; i < len; i++)
{
  if(gigantic_genre_array.indexOf(wordArray[i]) > -1)
   {
     alert(wordArray[i]);
   }
}

Answer 3

You may create a RegExp based on the array and test it against the string:

var gigantic_genre_array=['foo','bar','foobar'];
var thelongstr='where is the next bar';

alert(new RegExp(gigantic_genre_array.join('|')).exec(thelongstr)||[null][0]);
//returns bar