WebP supports both lossy and lossless compression.

WebP lossless images are 26% smaller than PNG and WebP lossy images are 25–34% smaller than JPEG.

Con: older browser does not support.

In Next.js project, you can see the difference.


WebP with lossless compression




  • Image was not rendered after the deployment even though it works in the locally.

NFD(Normalization Form DeComposition)

  • Canonical Decomposition of all syllables and save them using the Korean alphabet code
  • Usage in Mac OS X

NFC(Normalization Form Composition)

  • Canonical Decomposition of all syllables followed by Canonical Composition
  • Usage in GNU/Linux system, usually in Windows




34. Find First and Last Position of Element in Sorted Array


Given an array of integers nums sorted in non-decreasing order, find the starting and ending position of a given target value.

If target is not found in the array, return [-1, -1].

You must write an algorithm with O(log n) runtime complexity.

Example 1:

Input: nums = [5,7,7,8,8,10], target = 8
Output: [3,4]

Example 2:

Input: nums = [5,7,7,8,8,10], target = 6
Output: [-1,-1]

Example 3:

Input: nums = [], target = 0
Output: [-1,-1]


  • 0 <= nums.length <= 105
  • -109 <= nums[i] <= 109
  • nums is a non-decreasing array.
  • -109 <= target <= 109




WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested

M1 is an arm64/v8 architecture, so that Docker will build an image with arm64/v8 architecture. In order to use Docker image in AWS EC2, which generally uses amazonlinux OS and its architecture is linux/amd64, docker image should be a linux/amd64 architecture. So when you build, you can designate image’s platform to be based as linux/amd64.

docker build --no-cache --platform=linux/amd64 -t [TAG_NAME].