The stack.keys() method makes an array of strings as an argument and returns the stack generator.
Syntax:
stack.keys([keys])
Parameters: This method accepts a single parameter as mentioned above and described below.
- domain: This parameter holds an array of strings as key arguments.
Return Value: This method returns the stack generator.
Example:
HTML
<!DOCTYPE html> < html >
< head >
< meta charset = "utf-8" >
< script src =
</ script >
</ head >
< body >
< h1 style = "text-align: center; color: green;" >
GeeksforGeeks
</ h1 >
< center >
< canvas id = "gfg" width = "200" height = "200" >
</ canvas >
</ center >
< script >
var data = [
{a: 3840, b: 1920, c: 960, d: 400},
{a: 1600, b: 1440, c: 960, d: 400},
{a: 640, b: 960, c: 640, d: 400},
{a: 320, b: 480, c: 640, d: 400}
];
var stackGen = d3.stack()
// Defining keys
.keys(["a", "b", "c", "d"])
var stack = stackGen(data);
console.log(stack);
for (i = 0; i < 4 ; i++) {
// Displaying keys
console.log(stack[i].key);
}
</script>
</ body >
</ html >
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Output: