D3.js | d3.map.clear() Function

The map.clear() function in D3.js used to remove all the entries from the created map.

Syntax:

d3.map.clear();

Parameters: This function does not accept any parameter.



Return Value: This function does not return any values.

Below programs illustrate the d3.map.clear() function in D3.js:

Example 1:

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<!DOCTYPE html>
<html>
    
<head>
    <title> d3.map.clear() Function</title>
    
    <script src='https://d3js.org/d3.v4.min.js'></script>
</head>
  
<body>
  <script>
       
     // Creating a map
     var map = d3.map({"a": 1}, {"b": 2}, {"c": 3});
   
     // Calling the map.clear() function
     map.clear();
        
     // Checking whether the value for the specified key 
     // is present or not
     A = map.get("a");
        
    // Getting the output either value of the specified key
    // string or undefined if the key is not present
    console.log(A);
       
  </script>
</body>
  
</html>

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Output:

undefined

Example 2:

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<!DOCTYPE html>
<html>
    
<head>
    <title> d3.map.clear() Function</title>
    
    <script src='https://d3js.org/d3.v4.min.js'></script>
</head>
  
<body>
  <script>
       
     // Constructing a map
     var map = d3.map({"a": 0}, {"b": 1}, {"c": 2});
        
     // Checking whether the value for the specified key
     // is present or not before calling clear() function
     A = map.get("a");
        
     // Getting the output of value
     console.log(A);
       
     // Calling the map.clear() function
     map.clear();
       
     // Checking whether the value for the specified key
     // is present or not after calling clear() function
     B = map.get("a");
        
     // Getting the output of value
     console.log(B);
  </script>
</body>
  
</html>

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Output:

0
undefined

Ref: https://devdocs.io/d3~5/d3-collection#map_clear



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