How get first 4 letters from string by using jquery

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I am trying to get first 4 digit from string
but its show null

how i mistaken here

What I have tried:

alert("Result " + n_result);
      //n_result val 1500.02154
      lbtot1 = (n_result / 11)
      //lbtot1=136.36559454
      alert(lbtot1);
      var str1 = (n_result / 11);
      // str1 val = 136.36559454
      alert(str1 + " str1");


      var resu1 = str1.substring(0, 4);
      alert(resu1);
     // here he did not alert any value
     //did't show value
    // here i want to check is 4th digit/letters/chr  (136.) chr is "." or number

Posted 22-Apr-19 19:12pm

sayli1995

Updated 24-Apr-19 11:44am

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Richard Deeming · Accepted Answer · 2019-04-24T11:45:00

Quote:
here i want to check is 4th digit/letters/chr (136.) chr is "." or number

You can't call substring on str1 because it's not a string. But you don't need to - the only way the 4th character will be "." is if the number is greater than or equal to 100, and less than 1000. If n_result could be negative, then numbers greater than -100 and less than or equal to -10 will also have a "." as the 4th character.

JavaScript

var isFouthCharDot = (lbtot1 >= 100 && lbtot1 < 1000) || (lbtot1 > -100 && lbltot1 <= -10);

As a bonus, this will also avoid issues with cultures that use "," as the decimal separator.

Christian Graus · Accepted Answer · 2019-04-22T19:16:00

Solution 1

jquery is irrelevant here. If you want to convert a number into a string, call str1.toString()

Posted 22-Apr-19 19:16pm

Christian Graus