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String Methods and properties



String Methods and properties


length property

In javaScript if we want to count the length of the string then we use length property of the string.. 



  <script>
  
    var x="codes Family";
    var len=x.length;
    document.write(len);

</script>


indexOf() Method

By using indexOf() function we can find string inside the string. 


  <script>

         var str="welcome to code family";
         var x=str.indexOf("code");
         document.write(x);


</script>

lastIndexOf() Method

By using lastIndexOf() method we can get last occurs of the given string. 


  <script>

         var str="welcome to code family code family";
        var x=str.lastIndexOf("code");
        document.write(x);

</script>

search() Method

In javaScript if we want to search string inside a given string then we use search() method of a string. searchO() returns first occurance of the given string. 


  <script>

      var str="welcome to code family!";
    var x=str.search("code");
    document.write(x);


</script>

slice() Method

slice() method returns a particular slice or part of the string according to our requirement.slice method can also accept negative values. 


  <script>

        var str="welcome to your code family";
        var x=str.slice(16,27);
        document.write(x);


</script>

substring() Method

substring() is similar to slice() method ,the only difference is slice () method can accept negative values also but substring() can not accept negative values. 

  <script>

     var str="welcome to your code family";
    var x=str.substring(16,27);
    document.write(x);


</script>

substr() Method

substr() method is similar to the slice() method,the only difference is second parameter specifies the length of the given string. 


  <script>

     var str="red, black, blue";
    var x=str.substr(5,5);
    document.write(x);


</script>

replace() Method

replace() method is use to replace a given string in a javascript. 


  <script>

       var str="welcome to google";
       var x=str.replace("google","codefamily");
        document.write(x);



</script>

By default replace() method can replace first match of the string only,if ther is another mathch of string is available then replace() does not replace the value. 


  <script>

      
    var str="welcome to google and google";
    var x=str.replace("google","codefamily");
    document.write(x);


</script>

Converting Upper and lower case

If you want to convert a string to a upper case then we use toUpperCase() method. 


  <script>

      var str="code family";
    var x=str.toUpperCase();
    document.write(x);
     

</script>

we can also convert a given string to a lower case by using toLowercase() method. 


  <script>

    var str="CODE FAMILY";
    var x=str.toLowerCase();
    document.write(x);


</script>

concat() Method

If we want to add two string then we use concat() method of string. 


  <script>

    var x="code";
    var y="family";
    var str=x.concat(y);
    document.write(str);


</script>

trim() Method

trime() method is use to remove whitespaces of a string from both sides. 


  <script>

   var str="       code family         ";
var x=str.trim();
document.write(x);


</script>

charAt() method

charAt() method is use to return charcters at a specified index. 


  <script>

     var str="codes family";
    var x=str.charAt(3);
    document.write(x);



</script>

charCodeAt() method

charCodeAt() is ue=se to return unicode of the character at a specified index position. 


  <script>

      var str="codes family";
    var x=str.charCodeAt(3);
    document.write(x);


</script>

split() Method

split() method is generally use to convert string to an array. 


  <script>

   var str="codes family";
    var x=str.split("");
    document.write(x[0]);


</script>


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