Format a float number means to round off a number up to the given decimal place, ceiling, flooring, etc. There are many operations used to format the float number which are given below:
- Math.ceil() Method
- float.toFixed() Method
- Math.round() Method
- Math.floor() Method
- float.toExponential() Method
- number.toPrecision() Method
Math.ceil(), float.toFixed() and Math.round() Method: All the methods are similar and giving the same output. The implementation of Math.ceil() and Math.round() are totally same but the Math.round() function is used to round a number to its nearest integer.
Example:
<!DOCTYPE html> <html>   <head>     <title>         How to format a float         value in javascript ?     </title> </head>   <body>     <h1 style="color:green;">         neveropen     </h1>           <h3>         Format a float value         6.56759 in JavaScript     </h3>           <p id="d1"></p>     <p id="d2"></p>     <p id="d3"></p>     <p id="d4"></p>     <p id="d5"></p>       <script>         var n = 6.56759;                   // Rounds to next highest integer         document.getElementById("d1").innerHTML                 = "Math.ceil(n) = " + Math.ceil(n)                 + "<br />Math.round(n) = " + Math.round(n)                 + "<br />n.toFixed() = " + n.toFixed();                   // Rounds to the highest decimal upto one point         document.getElementById("d2").innerHTML                 = "Math.ceil(n*10)/10 = " + Math.ceil(n*10)/10                 + "<br />Math.round(n*10)/10 = "                + Math.round(n*10)/10                 + "<br />n.toFixed(1) = " + n.toFixed(1);                           // Rounds to the highest decimal upto two points         document.getElementById("d3").innerHTML                 = "Math.ceil(n*100)/100 = "                 + Math.ceil(n*100)/100                 + "<br />Math.round(n*100)/100 = "                + Math.round(n*100)/100                 + "<br />n.toFixed(2) = " + n.toFixed(2);                   // Rounds to the highest decimal upto three points         document.getElementById("d4").innerHTML                 = "Math.ceil(n*1000)/1000 = "                 + Math.ceil(n*1000)/1000                 + "<br />Math.round(n*1000)/1000 = "                + Math.round(n*1000)/1000                 + "<br />n.toFixed(3) = " + n.toFixed(3);                   // Rounds to the specified length, as the         // manipulation stops to the original float         document.getElementById("d5").innerHTML                 = "Math.ceil(n*1000000000)/1000000000 = "                + Math.ceil(n*1000000000)/1000000000                 + "<br />Math.round(n*1000000000)/1000000000 = "                + Math.round(n*1000000000)/1000000000                 + "<br />n.toFixed(9) = " + n.toFixed(9);     </script> </body>   </html> |
Output:
Math.floor() Method: The Math.floor() function is used to round off the number passed as a parameter to its nearest integer in Downward direction of rounding i.e. towards the lesser value.
Example:
<!DOCTYPE html> <html>   <head>     <title>         How to format a float         value in javascript ?     </title> </head>   <body>     <h1 style="color:green;">         neveropen     </h1>           <h3>         Format a float value         6.56759 in JavaScript     </h3>           <p id="d1"></p>     <p id="d2"></p>     <p id="d3"></p>       <script>         var n = 6.56759;                   // Rounds off to the floor value         document.getElementById("d1").innerHTML                 = "Math.floor(n) = " + Math.floor(n);                   // Rounds off upto one decimal place         document.getElementById("d2").innerHTML                 = "Math.floor(n*10)/10 = "                + Math.floor(n*10)/10;                           // Rounds off upto two decimal place         document.getElementById("d3").innerHTML                 = "Math.floor(n*100)/100 = "                + Math.floor(n*100)/100;     </script> </body>   </html> |
Output:
float.toExponential() Method: The toExponential() method is used to convert a number to its exponential form. It returns a string representing the Number object in exponential notation.
Example:
<!DOCTYPE html> <html>   <head>     <title>         How to format a float         value in javascript ?     </title> </head>   <body>     <h1 style="color:green;">         neveropen     </h1>           <h3>         Format a float number         in JavaScript     </h3>       <p id="GFG"></p>       <script>         var n1 = 5.569999999999999999999;         var n2 = 5.569999999999;                   // The complexity of the float results         // in its conversion         document.getElementById("GFG").innerHTML                 = "n1.toExponential() = "                + n1.toExponential()                 + "<br />n2.toExponential() = "                + n2.toExponential();     </script> </body>   </html> |
Output:
number.toPrecision() Method: The toPrecision() method is used to format a number to a specific precision or length. If the formatted number requires more number of digits than the original number then decimals and nulls are also added to create the specified length.
Example:
<!DOCTYPE html> <html>   <head>     <title>         How to format a float         value in javascript ?     </title> </head>   <body>     <h1 style="color:green;">         neveropen     </h1>           <h3>         Format a float number         in JavaScript     </h3>       <p id="d1"></p>     <p id="d2"></p>     <p id="d3"></p>           <script>         var n1 = 13.3714;         var n2 = 0.0016588874;         var n3 = 13.3714;                   document.getElementById("d1").innerHTML                 = "n1.toPrecision() = " + n1.toPrecision()                 + "<br \>n1.toPrecision(2) = " + n1.toPrecision(2)                 + "<br \>n1.toPrecision(3) = " + n1.toPrecision(3)                 + "<br \>n1.toPrecision(10) = " + n1.toPrecision(10);                   document.getElementById("d2").innerHTML                 = "n2.toPrecision() = " + n2.toPrecision()                 + "<br \>n2.toPrecision(2) = " + n2.toPrecision(2)                 + "<br \>n2.toPrecision(3) = " + n2.toPrecision(3)                 + "<br \>n2.toPrecision(10) = " + n2.toPrecision(10);                   document.getElementById("d3").innerHTML                 = "n3.toPrecision() = " + n3.toPrecision()                 + "<br \>n3.toPrecision(2) = " + n3.toPrecision(2)                 + "<br \>n3.toPrecision(3) = " + n3.toPrecision(3)                 + "<br \>n3.toPrecision(10) = " + n3.toPrecision(10);     </script> </body>   </html> |
Output:
