D3.js bisector() Function

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The bisector() Function in D3.js is used to returns a new bisector using the specified accessor or comparator function. This method can be used to bisect arrays of objects instead of being limited to simple arrays of primitives.

Syntax:

d3.bisector(accessor)
d3.bisector(comparator)

Parameters: This function accepts only one parameter which is mentioned above and described below:

accessor/comparator: This parameter is the can be accessor or comparator function.

Return value: This function returns the new bisector.

Below given are a few examples of the above function.

Example 1: This program illustrates the use of d3.bisector() using the accessor parameters.

<!DOCTYPE html>  
<html>  
    
<head>  
    <title>D3.js d3.bisector() Function</title>  
    
    <script src='https://d3js.org/d3.v4.min.js'> 
   </script>  
</head>  
    
<body>  
    <script>  
        var data = [ 
          {date: new Date(2011, 1, 1), value: 0.5}, 
          {date: new Date(2012, 2, 1), value: 0.6}, 
          {date: new Date(2013, 3, 1), value: 0.7}, 
          {date: new Date(2014, 4, 1), value: 0.8} 
        ];  
    
        var bisectDate =  
d3.bisector(function(d) { return d.date; }).left;  
        var dat = new Date(2014, 4, 1); 
        document.write(bisectDate(data, dat));  
    </script>  
</body>  
    
</html>

Output:

Example 2: This program illustrates the use of d3.bisector() using the comparator function parameters.

<!DOCTYPE html>  
<html>  
    
<head>  
    <title>D3.js d3.bisector() Function</title>  
    
    <script src='https://d3js.org/d3.v4.min.js'> 
    </script>  
</head>  
    
<body>  
    <script>  
        var data = [ 
          {date: new Date(2011, 1, 1), value: 0.5}, 
          {date: new Date(2012, 2, 1), value: 0.6}, 
          {date: new Date(2013, 3, 1), value: 0.7}, 
          {date: new Date(2014, 4, 1), value: 0.8} 
        ];  
    
        var bisectDate =  
d3.bisector(function(d, x) { return d.date - x; }).right; 
        var dat = new Date(2014, 4, 1); 
        document.write(bisectDate(data, dat));  
    </script>  
</body>  
    
</html>

Output:

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