The queue.defer() function in d3.js is used to add the asynchronous task callback to the queue. Where the task is a function to be executed. The callback must be executed when the task got finished.
Syntax:
queue.defer(task[, arguments…]);
Parameters: This function accepts a single parameter as mentioned above and described below:
- task: It is a function that is to be executed to perform a particular task.
Return Value: This function returns the object.
Below given are a few examples of the above function.
Example 1: When the size of the queue is equal to the number of queue.defer() calls.
HTML
<!DOCTYPE html> <html lang="en"> <head>     <meta charset="UTF-8">     <meta name="viewport"            path1tent="width=device-width,                        initial-scale=1.0">     <title>Document</title> </head> <style> </style> <body>   <script src =   </script>   <script>     function a(){       console.log("from a")     }     function b(){       console.log("from b")     }     function c(){       console.log("from c")     }     let q=d3.queue(3)     // Calling defer three times     q.defer(b)     q.defer(a)     q.defer(c)     console.log(q)     console.log("Size of q is: ",q._size)   </script> </body> </html> |
Output:
Example 2: When the size of the queue is less than the queue.defer() calls.
HTML
<!DOCTYPE html> <html lang="en"> <head>     <meta charset="UTF-8">     <meta name="viewport"            path1tent="width=device-width,                        initial-scale=1.0">     <title>Document</title> </head> <style> </style> <body>   <script src =   </script>   <script>     function a(){       console.log("from a")     }     function b(){       console.log("from b")     }     function c(){       console.log("from c")     }     let q=d3.queue(1)     // Calling defer three times but it will add only function     // call b because the size of the queue is one.     q.defer(b)     q.defer(a)     q.defer(c)     console.log(q)     console.log("Size of q is: ",q._size)   </script> </body> </html> |
Output:
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