Underscore.js _.uniqueId() Function
Underscore.js is a JavaScript library that provides a lot of useful functions that help in the programming in a big way like the map, filter, invoke, etc even without using any built-in objects.
The _.uniqueId() function is an inbuilt function in Underscore.js library of JavaScript which is used to generate a globally unique id for the client-side models or the DOM elements which requires one. When a prefix is passed as an argument to this method, the id generated will be appended to it.
Syntax:
_.uniqueId( prefix )
Parameters: It accepts a single parameter as mentioned above and described below:
- prefix: It is the prefix that would be appended to the id It is am optional parameter.
Return Value: This method returns a globally unique id.
Example 1:
HTML
<!DOCTYPE html>
< html >
< head >
< script src =
</ script >
</ head >
< body >
< script type = "text/javascript" >
// Using _.uniqueId() method
// with its parameter
console.log(_.uniqueId('gfG_'));
console.log(_.uniqueId('Geeks_'));
console.log(_.uniqueId('CS_'));
</ script >
</ body >
</ html >
|
Output:
gfG_1
Geeks_2
CS_3
Example 2:
HTML
<!DOCTYPE html>
< html >
< head >
< script src =
</ script >
</ head >
< body >
< script type = "text/javascript" >
// Using a loop
for (i = 3; i < 100 ; i *= 2) {
// Calling uniqueId method
// without any parameter
console.log(_.uniqueId());
}
</script>
</ body >
</ html >
|
Output:
1
2
3
4
5
6
Last Updated :
15 Oct, 2020
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