Underscore.js _.findKey() Function
The _.findKey() function is used to return the key value where the predicate logic or condition returns the truth value or undefined. The predicate function/condition is transformed through iteratee to facilitate shorthand syntaxes.
Syntax:
_.findKey(object, predicate, [context])
Parameters: This function accept three parameters as mentioned above and described below:
- list: This parameter is used to hold the list of items.
- predicate: This parameter is used to hold the truth condition.
- context: The text content which need to be display. It is optional parameter.
Return Value: It returns the key value where the predicate logic or condition returns truth or undefined.
Example 1:
<!DOCTYPE html> <html> <head> <script type="text/javascript" src= </script> </head> <body> <script type="text/javascript"> var info = { Company: 'GeeksforGeeks', Address: 'Noida', Contact: '+91 9876543210' }; var key = _.findKey(info, function (value) { return value === 'GeeksforGeeks'; }); console.log(key); </script> </body> </html> |
Output:
Example 2:
<!DOCTYPE html> <html> <head> <script type="text/javascript" src= </script> </head> <body> <script type="text/javascript"> var info = { key1: 'Geeks', key2: 'GFG', key3: 'GeeksforGeeks', key4: 'Hello', key5: 'Welcome' }; var key = _.findKey(info, function (value) { return value.length == 13; }); console.log(key); </script> </body> </html> |
Output:
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