How to convert string into float in JavaScript?

We can convert a string into a float in JavaScript by using some methods which are described below:

Method 1: In this method we will use the Type Conversion feature of JavaScript which will convert the string value into float.

Example: Below program demonstrates the above approach



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<script> 
    // Javascript script  
    // to convert string
    // to float value 
    
    // Function to convert 
    // string to float value
    function convert_to_float(a) {
          
        // Type conversion
        // of string to float
        var floatValue = +(a);
          
        // Return float value
        return floatValue; 
    } 
    
//Driver code 
var n = "55.225";
    
// Call function 
n = convert_to_float(n); 
    
// Print result 
document.write("Converted value = " + 
        n + "</br> Type of " + n + " = " 
        +typeof n + "<br>");
  
var n = "-33.565";
    
// Call function 
n = convert_to_float(n); 
    
// Print result 
document.write("Converted value = " + 
        n + "</br> Type of " + n + " = " 
        +typeof n + "<br>");
</script> 

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Output:


Converted value = 55.225
Type of 55.225 = number
Converted value = -33.565
Type of -33.565 = number



Method 2: In this method we will use the parseFloat() method which is an inbuilt function in JavaScript that is used to accept the string and convert it into a floating point number. If the string does not contain a numeral value or If the first character of the string is not a Number then it returns NaN i.e, not a number.


Example: Below program demonstrates the above approach











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<script>  


    // Javascript script   


    // to convert string 


    // to float value  


    


    // Function to convert  


    // string to float value 


    function convert_to_float(a) { 


          


        // Using parseFloat() method 


        var floatValue = parseFloat(a); 


          


        // Return float value 


        return floatValue;  


    }  


    


//Driver code  


var n = "245.165"; 


    


// Call function  


n = convert_to_float(n);  


    


// Print result  


document.write("Converted value = " +  


        n + "</br> Type of " + n + " = " 


        +typeof n + "<br>"); 


  


var n = "-915.55"; 


    


// Call function  


n = convert_to_float(n);  


    


// Print result  


document.write("Converted value = " +  


        n + "</br> Type of " + n + " = " 


        +typeof n + "<br>"); 


</script>  



















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Output:


Converted value = 245.165
Type of 245.165 = number
Converted value = -915.55
Type of -915.55 = number



Special Case: In French the float numbers are written by the use of comma (, ) as separator instead of dot(.) as separator.

Example:


The value 245.67 in French is written as 245, 67



To convert French string into float in JavaScript we will first use replace() method to replace every (, ) with (.) then follow any of above described method.


Example: Below program demonstrates the above approach











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<script>  


    // Javascript script   


    // to convert string 


    // to float value  


    


    // Function to convert  


    // string to float value 


    function convert_to_float(a) { 


          


        // Using parseFloat() method 


        // and using replace() method 


        // to replace ', ' with '.' 


        var floatValue = parseFloat(a.replace(/, /, '.')); 


          


        // Return float value 


        return floatValue;  


    }  


    


//Driver code  


var n = "245, 165"; 


    


// Call function  


n = convert_to_float(n);  


    


// Print result  


document.write("Converted value = " +  


        n + "</br> Type of " + n + " = " 


        +typeof n + "<br>"); 


  


var n = "-915, 55"; 


    


// Call function  


n = convert_to_float(n);  


    


// Print result  


document.write("Converted value = " +  


        n + "</br> Type of " + n + " = " 


        +typeof n + "<br>"); 


</script>  



















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Output:


Converted value = 245.165
Type of 245.165 = number
Converted value = -915.55
Type of -915.55 = number




          
          
          
          

            

    

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