Shulou(Shulou.com)06/03 Report--

Today, I will talk to you about the skills of JavaScript array simplification, which may not be well understood by many people. In order to make you understand better, the editor has summarized the following contents for you. I hope you can get something according to this article.

Array is a very common data structure in JS, and we often use it in development. Let's take a look at some tips to help us improve our development efficiency.

1. Delete duplicates from an array

two。 Replace a specific value in an array

Sometimes you need to replace specific values in an array when creating code, and there is a good short way to do this. We can use .splice (start, value to remove, valueToAdd), these parameters specify where we want to start, how many values we want to modify, and replace new values.

3. Array.from achieves the effect of .map

We all know that the .map () method and the .map () method can be used to achieve a similar effect and the code is concise.

4. Empty array

Sometimes we need to empty the array, and a quick way to do this is to let the array's length property be 0.

5. Convert an array to an object

Sometimes, for some purpose, you need to convert an array into an object, and a simple and quick way is to use the expansion operation symbol (.):

6. Populate the array with data

In some cases, the .fill () method can help us when we create an array and want to populate it with some data.

7. Array merging

You can also combine multiple numbers using the unfold operator.

8. Find the intersection of two arrays

Finding the intersection of two arrays is also a difficult point in the interview. in order to find the intersection of two arrays, we first use the above method to ensure that the values in the checked array are not duplicated, and then use the .filter method and the .filter method. As follows:

9. Remove an imaginary value from an array

In JS, the imaginary values are false, 0jime, null, NaN, undefined. We can filter these virtual values with the .filter () method.

10. Get random values from an array

Sometimes we need to randomly select a value from the array. A convenient way is to get a random index based on the length of the array, as follows:

11. Reverse array

Now, when we need to reverse the array, there is no need to create it through complex loops and functions, the reverse method of the array can do it:

12 lastIndexOf () method

13. Sum all values in an array

Reduce method is often used to solve problems skillfully in JS interview.

After reading the above, do you have any further understanding of JavaScript array reduction techniques? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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