gotraveltoworld

// Reference: https://codepen.io/macmladen/pen/XBwgEa/

let arr = [1, 2, 3, 4, 5, 1, 2 ,3, 4, 5];
// Set, this is a simple and plain method.
[...new Set(arr)];

// filter, a built-in method based on the filter function.
arr.filter((item, index) => arr.indexOf(item) === index);
// Retrieve the duplicate values
arr.filter((item, index) => arr.indexOf(item) !== index);

gotraveltoworld

<script src="https://unpkg.com/vue@2.5.16/dist/vue.js"></script>
<div id="app">
  <p>the input is: <span class="name">{{result}}</span></p>
   <input type="text" 
    :value=result
    @input="compositionend" 
    @compositionstart="compositionstart($event)"
    @compositionend="compositionend($event)"
  />
</div>

gotraveltoworld

How to use the one command to copy JSON prettify JSON.

1. echo '{"test1": 1, "test2": true}' | json_pp => To show the result.
2. echo '{"test1": 1, "test2": true}' | json_pp | pbcopy => To copy into paste note

gotraveltoworld

Git

from: https://stackoverflow.com/questions/179123/how-to-modify-existing-unpushed-commit-messages?answertab=active#tab-top

Use one command (for lastest commit)

git commit --amend -m "<New message>"

Use interactive rebase

// X is the number of commits to the last commit you want to be able to edit
git rebase -i HEAD~X

gotraveltoworld

// Nodejs's Path built-in library.
let path = require('path');

// Get dir's path.
let dirPath = path.dirname('/xx/yy/zz.js');
console.log('dirPath', dirPath);

// Get join's path.
let joinPath = path.join(__dirname, '/xx');
console.log('joinPath', joinPath);

gotraveltoworld

class First(object):
    def member1(self, n):
        return n

    @classmethod
    def member2(cls, n):
        # Call the static member.
        n += cls.member3(n)
        # Call the normal member.
        n += cls.member1(cls, n)

gotraveltoworld

FROM lambci/lambda:build-python3.6

WORKDIR /var/task
ENV WORKDIR /var/task

# Make the dir and to install all packages into packages/
RUN mkdir -p packages/ && \
    pip install uuid -t packages/

# Copy initial source codes into container.

gotraveltoworld

// 測試迴圈內 "i" 的結果，這題要重新研究var 和 let 之間的關係(重點在全域綁定和區域綁定)
for (var i = 0; i < 10; i ++) {
    setTimeout(function() {
        console.log(i);
    }, 10);
}
for (let i = 0; i < 10; i ++) {
    setTimeout(function() {
        console.log(i);
    }, 10);

gotraveltoworld

Show pods info.

  kubectl get pods

Show all pods.

  kubectl get pods --show-all

Get specify pod's decribe.

gotraveltoworld

# first_pod.yaml
apiVersion: v1
kind: Pod
metadata:
  name: k8s-pod-nodejs
  labels:
    app: webserver
spec:
  containers:
  - name: k8s-pod-nodejs