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Lodash _.lastIndexOf


The lodash _.lastIndexOf() function is a commonly used JavaScript utility method that allows you to find the index of the last occurrence of a specified element within an array. This method is very similar to the native Array.lastIndexOf() method, with a few notable differences.

One key difference is that the lodash _.lastIndexOf() method performs a backward search through the array, starting at the end and moving towards the beginning, whereas the native method performs a forward search, starting at the beginning and moving towards the end.

Another difference is that the lodash method supports an optional fromIndex parameter, which allows you to specify the index to start the search from. This is useful if you want to restrict the search to a particular portion of the array.

Here is the basic syntax for using the _.lastIndexOf() method:

_.lastIndexOf(array, value, [fromIndex])
  • array: The array to search through.
  • value: The value to search for within the array.
  • fromIndex (optional): The index to start the search from. If not specified, the entire array will be searched.

The method returns the index of the last occurrence of the specified value within the array, or -1 if the value is not found.

Here is an example usage of the _.lastIndexOf() method:

const array = ['apple', 'banana', 'cherry', 'apple', 'banana'];
const index = _.lastIndexOf(array, 'apple');
console.log(index); // Output: 3

In this example, the method is used to find the index of the last occurrence of the string 'apple' within the array. Since the value appears twice within the array, the method returns the index 3 (the index of the last occurrence).

Overall, the lodash _.lastIndexOf() method is a useful utility function that can simplify your code and help you perform efficient searches of arrays.