Underscore.js _.pickWhen() Method
Last Updated :
19 Aug, 2020
The _.pickWhen() method returns a copy of the object containing those properties for which the given predicate function returns true. The predicate function is invoked with each property value.
Syntax:
_.pickWhen( Object_name, predicate_func );
Parameters:
- Object_name: Object from which the key/value pair is to be picked.
- predicate_func: Given function which contains the conditions for properties is to be picked
Return Value: This method returns a copy of the object after containing properties.
Note: This will not work in normal JavaScript because it requires the underscore.js contrib library to be installed.
Underscore.js contrib library can be installed using npm install underscore-contrib –save.
Example 1:
Javascript
var _ = require( 'underscore-contrib' );
var obj = {
1: "Gfg1" ,
2: "Gfg2" ,
3: "Gfg3"
};
var val = _.pickWhen(obj, function (id)
{ return id == "Gfg1" });
console.log(val);
|
Output:
{ '1': 'Gfg1' }
Example 2: If no property is found in the object, this method picks nothing.
Javascript
var _ = require( 'underscore-contrib' );
var obj = {
1: "Gfg1" ,
2: "Gfg2" ,
3: "Gfg3"
};
var val = _.pickWhen(obj, function (id)
{ return id == "Gfg4" });
console.log(val);
|
Output:
{}
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