The nest.entries() function in D3.js is used to generate the nest and is applies a nest operator to every level of hierarchy rather than the outmost layer only.
Syntax:
nest.entries(array)
Parameters: It takes only one parameter given above and described below.
- Array: It is the array of objects.
Return Value: It returns the array of key-value entries.
Below given are a few examples of the above function.
Example 1: When no entries function is used and keys are assigned.
<!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>
<script type = "text/javascript"
</script>
<script>
// Forming the array of objects
let array=[
{val:"val10", data:"data11"},
{val:"val20", data:"data22"},
{val:"val30", data:"data33"},
{val:"val30", data:"data33"},
{val:"val30", data:"data33"},
{val:"val50", data:"data33"},
{val:"val40", data:"data44"}
]
let data= d3.nest()
.key(function(d) { return d.val; })
console.log(data);
</script>
</body>
</html>
|
Output:
Example 2: When entries function is used with the nest.
<!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>
<script type = "text/javascript"
</script>
<script>
// Forming the array of objects
let array=[
{val:"val10", data:"data11"},
{val:"val20", data:"data22"},
{val:"val30", data:"data33"},
{val:"val30", data:"data33"},
{val:"val30", data:"data33"},
{val:"val50", data:"data33"},
{val:"val40", data:"data44"}
]
let data= d3.nest()
.key(function(d) { return d.val; })
.entries(array)
console.log("Type is: ", typeof array)
console.log(data);
</script>
</body>
</html>
|
Output:
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