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:
<!DOCTYPE html> <html> <head> <title> d3.map.clear() Function</title> </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> |
Output:
undefined
Example 2:
<!DOCTYPE html> <html> <head> <title> d3.map.clear() Function</title> </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> |
Output:
0 undefined
Ref: https://devdocs.io/d3~5/d3-collection#map_clear
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