Underscore.js _.before() Function
_.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("geeks for geeks")
}
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("geeks for geeks")
}
//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:
Last Updated :
20 Dec, 2022
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