jtr109

(define (average x y)
  (/ (+ x y) 2))

(define (improve guess x)
  (average guess (/ x guess)))

(define (goodenough? guess x)
  (< (/ (abs (- guess
                (improve guess x)))
        guess)

jtr109

alias rebase_upstream="export CURRENT_BRANCH_NAME=`git branch | grep \* | cut -d ' ' -f2` && git checkout master && git pull upstream master && git checkout $CURRENT_BRANCH_NAME && git rebase master"

jtr109

find -name "*" -print0 | xargs -0 dos2unix
// TODO: the binary files will raise warning without convert.

jtr109

微信底部弹出框

参考JS中微信小程序自定义底部弹出框, 整理而成.

jtr109

import os

WXAPP_TEST_SITEUSER = os.getenv('WXAPP_TEST_SITEUSER')  # return None if not exist

jtr109

It is the third of exercise 1 in Yet Another Scheme Tutorial. The answer is difficult for a beginner to understand. Here is an easier answer for this exercise on StackOverflow.

Thanks for the author of YAST and the answer of the question.

jtr109

UPDATE "area_genericimage"
    SET "sort" =
        CASE WHEN "id" = 40964 THEN 1
             WHEN "id" = 40965 THEN 2
        END
WHERE "area_genericimage"."id" in (40964, 40965)

jtr109

#!/bin/bash
# Copy a file with time as tail.
# Reference: https://i.linuxtoy.org/docs/guide/ch15s05.html
sudo cp $1 $1_`date +%y%m%d_%H:%M:%S`

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Datetime

Native and aware

Definition

There are two kinds of date and time objects: “naive” and “aware”.

An aware object has sufficient knowledge of applicable algorithmic and political time adjustments, such as time zone and daylight saving time information, to locate itself relative to other aware objects. An aware object is used to represent a specific moment in time that is not open to interpretation.

jtr109

Eslint tips