jQuery deferred.always() Method

Underscore.js _.isDate() function

Last Updated : 14 Jul, 2020

Underscore.js is a javascript library that is capable enough to handle arrays, strings, objects, map, set very easily and efficiently. The _.isDate() function in underscore.js is used to tell if the given object is a date object or not.

Syntax:

_.isDate(object);

Parameters: It takes only one parameter i.e the object.

Return: This function returns a boolean value. The value is true is the object is date object else it is false.

Note: Please Link the underscore CDN before using this code directly in the browser through the code.

Example 1:

<!DOCTYPE html>  
<html>  
  <head>  
    <script src =   
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore-min.js" >  
    </script>  
   </head>  
  <body> 
    <script> 
      let date=new Date() 
      let str="9/9/9"; 
      console.log(_.isDate(date)); 
      console.log(_.isDate(str)); 
    </script> 
  </body>  
</html>

Output:

Example 2:

<!DOCTYPE html>  
<html>  
  <head>  
    <script src =   
"https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.9.1/underscore-min.js" >  
    </script>  
   </head>  
  <body> 
    <script> 
      let date1=new Date(); 
      let date2="09-jan-1888" 
      let boolDate1=_.isDate(date1); 
      let boolDate2=_.isDate(date2); 
      if(boolDate1) 
      console.log( 
`_.isDate function returns ${boolDate1} \n date is:  ${date1}`) 
      else 
      console.log( 
`_.isDate function returns ${boolDate1}  
\n ${data1} is not a date object`) 
      if(boolDate2) 
      console.log( 
`_.isDate function returns ${boolDate2} \n date is ${date2}`) 
      else 
      console.log( 
`_.isDate function returns ${boolDate2}  
\n ${date2} is not a date object`) 
    </script> 
  </body>  
</html>

Output:

jQuery deferred.always() Method

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