javascript reduce array of objects by key

sure! in javascript, the `reduce` method is used to reduce an array into a single value. when working with an array of objects and you want to reduce it based on a specific key, you can use the `reduce` method in conjunction with the key you want to reduce by.

let's say you have an array of objects representing different items with a "price" property, and you want to calculate the total price of all items in the array:

in the example above, we first define an array of objects called `items`. we then use the `reduce` method on the `items` array. the `reduce` method takes a callback function with two parameters: an accumulator (`acc`) and the current item in the array (`item`). we start with an initial value of `0`.

inside the callback function, we add the `price` of the current `item` to the accumulator `acc`. the result of this operation is accumulated in `acc` as we iterate over each item in the array.

finally, we get the total price of all items in the array by accessing the final accumulated value.

i hope this tutorial was helpful! let me know if you have any questions.

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