_.before() function in underscore.js is used to call a particular function a particular number of times. It uses a count variable that keeps the track of number of times the function is called.
Syntax:
_.before(count, function)
Parameters:
- Count: It is the number of times a function is to be called.
- Function: It is the function that runs the count times.
Return: This function returns  the count of the function call.
Note: Please Link the underscore CDN before using this code directly in the browser through the code.
Example 1:
html
<!DOCTYPE html> <html>   <head>     <script src =     </script>   </head>   <body>     <script>      let print=()=>{        console.log("neveropen for neveropen")      }      console.log(`Print function will only run 3 times`)      //the print function cannot run more than 3 times      count=_.before(4, print);      //calling count function more than 3 times      count();      count();      count();      count();      count();      count();      count();    </script>  </body> </html> |
Output:
Example 2:
It is clear from the example that if The button is clicked again and again then print function will not be working as it as already reached the count.
html
<!DOCTYPE html> <html>   <head>     <script src =     </script>    </head>   <body>     <button id="btn">button</button>    <script>      let print=()=>{        console.log("neveropen for neveropen")      }      //the print function cannot run more than 99 times      count=_.before(100, print);      //calling count function more than 99 times      let btn=document.querySelector("#btn");      let run=()=>{      console.log(`Print function will only run 99 times`)        for(let i=0; i<5000; i++){          count()        }      }      btn.addEventListener("click", run)    </script>  </body> </html> |
Output:
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