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 _.negate() function is an inbuilt function in Underscore.js library of JavaScript which is used to find a new negated version of the stated predicate function.
Syntax:
_.negate(predicate)
Parameters: It accepts a single parameters which is specified below:
- predicate: It is the stated predicate function.
Return Value: This method returns a new negated version of the stated predicate function.
Example 1:
<!DOCTYPE html> <html> <head> <script src= </script> </head> <body> <script> var isNaN = _.negate(Boolean); console.log(_.find( [3, -11, undefined, 41, 0], isNaN)); </script> </body> </html> |
Output:
undefined
Example 2:
<!DOCTYPE html> <html> <head> <script src= </script> </head> <body> <script> function isCSportal(character) { return character === "neveropen"; } var isNotCSportal = _.negate(isCSportal); console.log(isNotCSportal("neveropen")); console.log(isNotCSportal("GfG")); </script> </body> </html> |
Output:
false true
Reference: https://underscorejs.org/#negate
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