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;"> neveropen </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> |
Output:
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