The _.renameKeys() method takes an object and a mapping object and returns a new object where the keys of the given object have been renamed as the corresponding value in the keyMap.
Syntax:
_.renameKeys(obj, mapObj);
Parameters:
- obj: Given object to create a new object.
- mapObj: Given map object to create a new object.
Return Value: This method returns a generated object.
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 = _.renameKeys( { 1 : "Geeks", 2 : "Computer_Science_Portal" }, { 1 : "g", 2 : "c" }); console.log("Generated Object: ", obj); |
Output:
Generated Object: { g: 'Geeks', c: 'Computer_Science_Portal' }
Example 2: If two or more key value pair is coming to be the same in the object, the generated object will have a unique key value pair.
Javascript
// Defining underscore contrib variable var _ = require('underscore-contrib'); var obj = _.renameKeys( { 1 : "Geeks", 2 : "Computer_Science_Portal", 3 : "Geeks" }, { 1 : "g", 2 : "c", 3 : "g" }); console.log("Generated Object: ", obj); |
Output:
Generated Object: { g: 'Geeks', c: 'Computer_Science_Portal' }
Example 3: If the given object is an arr, new object created will be mapped using the index of objects of that array.
Javascript
// Defining underscore contrib variable var _ = require('underscore-contrib'); var obj = _.renameKeys( [ "Computer_Science_Portal", "Geeks" ], { 0 : "a", 1 : "b", 3 : "g" }); console.log("Generated Object: ", obj); |
Output:
Generated Object: { a: 'Computer_Science_Portal', b: 'Geeks' }
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