how to use the thru function from lodash in javascript

The thru function from lodash is a powerful tool for method chaining in JavaScript. It allows you to pass the output of one function as the input to another function in a concise and readable way.

Here's an example of how to use the thru function in JavaScript:

index.tsx
const myArray = [1, 2, 3, 4, 5];

const result = _(myArray)
  .map(num => num * 2)
  .thru(arr => _.filter(arr, num => num % 4 === 0))
  .value();

console.log(result); // [4, 8]
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In this example, we first create an array myArray with five numbers in it. We then use the lodash _ function to wrap the array and enable method chaining.

We then use the map function to multiply each number in the array by 2, and then pass the resulting array to the thru function.

The thru function takes a callback function as an argument, and passes the current value (in this case, the mapped array) as an argument to that callback function. The callback function can then manipulate the data in any way it wants and return a new value.

In this example, our callback function uses the lodash filter function to remove any numbers that are not divisible by 4. The resulting array (with only the numbers 4 and 8) is then returned by the callback function and passed on to the next function in the chain.

Finally, we call the value function to get the final result of the chain, which is the array [4, 8].

Overall, using the thru function in combination with method chaining can help you write more concise and readable code for manipulating arrays (or other kinds of data) in JavaScript.