The _.omitWhen() method returns a copy of the object omitting those properties for which the given predicate function returns true. The predicate function is invoked with each property value.
Syntax:
_.omitWhen( Object_name, predicate_func );
Parameters:
- Object_name: Object from which the key/value pair is to be omitted.
- predicate_func: Given function which contains the conditions for properties is to be omitted
Return Value: This method returns a copy of the object after omitting 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
// Defining underscore contrib variable var _ = require('underscore-contrib'); var obj = { 1: "Gfg1", 2: "Gfg2", 3: "Gfg3"}; var val=_.omitWhen(obj, function (id) { return id == "Gfg2" }); console.log(val); |
Output:
{ '1': 'Gfg1', '3': 'Gfg3' }
Example 2: If no property is found in the object, this method omits nothing.
Javascript
// Defining underscore contrib variable var _ = require('underscore-contrib'); var obj = { 1: "Gfg1", 2: "Gfg2", 3: "Gfg3"}; var val=_.omitWhen(obj, function (id) { return id == "Gfg4" }); console.log(val); |
Output:
{ '1': 'Gfg1', '2': 'Gfg2', '3': 'Gfg3' }
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