reduce() method is used to reduce an array to a single value by executing a callback function for each element of the array, taking four arguments: the accumulator, the current value, the current index, and the original array.
Here is an example of
reduce() being used to find the sum of all elements in an array:
const numbers = [10, 20, 30, 40]; const sum = numbers.reduce((accumulator, currentValue) => accumulator + currentValue, 0); console.log(sum); // Output: 100
In the above code, we initialize the
0 and then iterate over each element of the array. In each iteration, we add the
currentValue to the
accumulator, and finally, we get the total sum of all the elements in the array.
filter() method is used to filter out elements from an array that don't meet a specified condition, creating a new array with only the filtered elements.
Here is an example of
filter() being used to filter out all even numbers from an array:
const numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; const oddNumbers = numbers.filter((number) => number % 2 !== 0); console.log(oddNumbers); // Output: [1, 3, 5, 7, 9]
In the above code, we use the
filter() method to create a new array
oddNumbers that contains only the odd numbers from the original
numbers array. The condition for filtering is that the number should not be divisible by 2.
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
- Your name, rating, website address, town, country, state and comment will be publicly displayed if entered.
- Aside from the data entered into these form fields, other stored data about your comment will include:
- Your IP address (not displayed)
- The time/date of your submission (displayed)
- Your email address will not be shared. It is collected for only two reasons:
- Administrative purposes, should a need to contact you arise.
- To inform you of new comments, should you subscribe to receive notifications.
- A cookie may be set on your computer. This is used to remember your inputs. It will expire by itself.
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
- Although the administrator will attempt to moderate comments, it is impossible for every comment to have been moderated at any given time.
- You acknowledge that all comments express the views and opinions of the original author and not those of the administrator.
- You agree not to post any material which is knowingly false, obscene, hateful, threatening, harassing or invasive of a person's privacy.
- The administrator has the right to edit, move or remove any comment for any reason and without notice.
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
- Data Science
- React Native
- Cloud Computing
- Java Beans
- Mac OS X
- Office 365
- Tech Reviews