Lodash _.mapKeys() method is used to create an object with the same values as the object and the keys created by running each of the object's own enumerable string keys.
Syntax:
_.mapKeys(object, iteratee);Parameters:
- object: This parameter holds the object to iterate over.
- iteratee: It is the function that is invoked per iteration.
Return Value:
This method returns the new mapped object.
Example 1: In this example, we are adding the key and value by the use of the function that is passing into the lodash _.mapKeys() method and print the result in the console.
// Requiring the lodash library
const _ = require("lodash");
// Using the _.mapKeys() method
console.log(
_.mapKeys({ 'cpp': 15, 'java': 40, 'python': 63 },
function (value, key) {
return key + value;
}
));
Output:
{'cpp15': 15, 'java40': 40, 'python63': 63}Example 2: In this example, we are returning the age by the use of the function that is passing into the lodash _.mapKeys() method and print the result in the console.
// Requiring the lodash library
const _ = require("lodash");
// The source object
let info = {
'GFG': { 'user': 'amit', 'age': 23 },
'codechef': { 'user': 'priya', 'age': 21 }
};
// Using the _.mapKeys() method
console.log(_.mapKeys(info,
function (o) { return o.age; })
);
Output:
{21: {'age': 21, 'user': "priya"}, 23: {'age': 23, 'user': "amit"}}
