D3.js | d3.map.empty() Function
Last Updated :
28 Jun, 2019
The map.empty() function in D3.js is used to return true if the created map containing zero entries otherwise returns false.
Syntax:
map.empty();
Parameters: This function does not accept any parameter.
Return Value: This function returns true if the map is empty otherwise returns false.
Below programs illustrate the d3.map.empty() function in D3.js:
Example 1:
<!DOCTYPE html>
<html>
<head>
<title>
d3.map.empty() Function
</title>
</head>
<body>
<script>
var map1 = d3.map({ "a" : 1}, { "b" : 2}, { "c" : 3});
var map2 = d3.map();
A = map1.empty();
B = map2.empty();
console.log(A);
console.log(B);
</script>
</body>
</html>
|
Output:
false
true
Example 2:
<!DOCTYPE html>
<html>
<head>
<title>
d3.map.empty() Function
</title>
</head>
<body>
<script>
var map1 = d3.map({ "a" : 1}, { "b" : 2}, { "c" : 3});
var map2 = d3.map({ "GFG" : 5});
var map3 = d3.map({});
var map4 = d3.map();
A = map1.empty();
B = map2.empty();
C = map3.empty();
D = map4.empty();
console.log(A);
console.log(B);
console.log(C);
console.log(D);
</script>
</body>
</html>
|
Output:
false
false
true
true
Ref: https://devdocs.io/d3~5/d3-collection#map_empty
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