Lodash _.transform() Method
Lodash _.transform() method is an alternative to the _.reduce() method transforms an object to a new accumulator object which is the result of running each of its own enumerable string keyed properties through iteratee with each invocation potentially mutating the accumulator object. A new object with the same prototype will be used if an accumulator is not provided.
Syntax:
_.transform(object, iteratee, accumulator);
Parameters:
- object: It holds the object to iterate over.
- iteratee: It is the function that the method invoked per iteration for every element.
- accumulator: It holds the custom accumulator value.
Return Value:
This method returns the accumulated value.
Example 1: In this example, we are transforming the given array by the use of the lodash _.transform() method.
javascript
// Requiring the lodash library const _ = require( "lodash" ); // Original array let object = [12, 13, 14]; // Using the _.transform() method let st_elem = _.transform(object, function (result, n) { result.push(n *= n); return n % 2 == 0; }, []); // Printing the output console.log(st_elem); |
Output:
144, 169
Example 2: In this example, we are transforming the given array by the use of the lodash _.transform() method.
javascript
// Requiring the lodash library const _ = require( "lodash" ); // Original array let object = { 'p' : 3, 'q' : 6, 'r' : 3 }; // Using the _.transform() method let st_elem = _.transform(object, function (result, value, key) { (result[value] || (result[value] = [])).push(key); }, {}); // Printing the output console.log(st_elem); |
Output:
{ '3': ['p', 'r'], '6': ['q'] }
Note: This code will not work in normal JavaScript because it requires the library lodash to be installed.
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