D3.js precisionPrefix() Function

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The precisionPrefix() function of D3.js is used to return a specified precision, in turn, to be used with locale.formatPrefix.

Syntax:

d3.precisionPrefix(step, value);

Parameters: It takes the two parameters given above and described below.

Step: It tells the minimum difference between the values that are required to be formatted.
Value: Value here tells that what SI prefix is to be used with the given number e.g M for million or G for Giga.

Returns: It returns the number.

Below given are a few examples of the above function.

Example 1: Here p is 4 that means 4 digits will be there after the decimal.

<!DOCTYPE html> 
<html lang="en"> 
<head> 
  <meta charset="UTF-8"> 
  <meta name="viewport" 
        content="width=device-width,  
                 initial-scale=1.0"> 
  <title>Document</title> 
</head> 
<style> 
</style> 
<body> 
  <!--Fetching from CDN of D3.js -->
  <script type = "text/javascript" 
          src = "https://d3js.org/d3.v4.min.js"> 
   </script> 
  <script> 
    // Here p is 4 that means for digits after decimal 
    var p = d3.precisionPrefix(1e5, 1.2e10); 
    let f = d3.formatPrefix("." + p, 1.2e10); 
    let roundedNumber=f( 1.2e12); 
    // Number of digits after decimal 
    console.log("Value of p is: ", p); 
    console.log("Type of p is: ", typeof p) 
    // Old number is  
    console.log("Old number is: ", 1.2e12); 
    // Number after the use of the precisionprefix 
    console.log("New number is: ", roundedNumber); 
  </script> 
</body> 
</html> 

Output:

Example 2:

<!DOCTYPE html> 
<html lang="en"> 
<head> 
  <meta charset="UTF-8"> 
  <meta name="viewport"
        content="width=device-width,  
                 initial-scale=1.0"> 
  <title>Document</title> 
</head> 
<style> 
</style> 
<body> 
  <!--Fetching from CDN of D3.js -->
  <script type = "text/javascript"
          src = "https://d3js.org/d3.v4.min.js"> 
   </script> 
  <script> 
    var p = d3.precisionPrefix(1e2, 4.1e4); 
    var f = d3.formatPrefix("." + p, 4.e1); 
    var newNumber=f(4.85e10); 
    // Number of digits after decimal 
    console.log("Value of p is: ", p); 
    // Old number is  
    console.log("Old number is: ", 4.85e10); 
    // Number after the use of the precisionprefix 
    console.log("New number is: ", newNumber); 
    console.log("\n"); 
      
    var p = d3.precisionPrefix(1e2, 4.1e4); 
    var f = d3.formatPrefix("." + p, 4.e5); 
    var newNumber=f(4.85e10); 
    // Number of digits after decimal 
    console.log("Value of p is: ", p); 
    // Old number is  
    console.log("Old number is: ", 4.85e10); 
    // Number after the use of the precisionprefix 
    console.log("New number is: ", newNumber); 
    console.log("\n"); 
      
    var p = d3.precisionPrefix(1e4, 4.1e14); 
    var f = d3.formatPrefix("." + p, 4.e10); 
    var newNumber=f(4.85e10); 
    // Number of digits after decimal 
    console.log("Value of p is: ", p); 
    // Old number is  
    console.log("Old number is: ", 4.85e10); 
    // Number after the use of the precisionprefix 
    console.log("New number is: ", newNumber); 
    console.log("\n"); 
  </script> 
</body> 
</html> 

Output:

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