YanhaoYang

irb(main):001:0> 1.upto(Float::INFINITY).lazy.
irb(main):002:0*   map { |x| puts "1 #{x}"; x * x }.
irb(main):003:0*   map { |x| puts "2 #{x}"; x + 1 }.
irb(main):004:0*   take(10).to_a
1 1
2 1
1 2
2 4
1 3
2 9

YanhaoYang

#!/bin/bash

pods=($(kubectl get po | grep -E 'api|db' | awk '{print $1}'))

for var in "${pods[@]}"
do
  case "$var" in
    *api*)
      api_cmd="kubectl port-forward $var 3000:3000"
    ;;

YanhaoYang

func updateAll(ids []string) {
	var params []string
	var values []interface{}
	for k, v := range ids {
		params = append(params, fmt.Sprintf("$%d", k+1))
		values = append(values, v)
	}
	db := viper.Get("db").(*gorp.DbMap)
	sql := "UPDATE stores SET active = false WHERE id IN (" + strings.Join(params, ",") + ")"
	rs, err := db.Exec(sql, values...)

YanhaoYang

// BaseError ...
type BaseError struct {
	s string
}

func (e *BaseError) Error() string {
	return e.s
}

// SomeError ...

YanhaoYang

DO $$DECLARE quantity integer := 1; maxid integer; cnt integer; total integer := 0;
  BEGIN
    SELECT max(id) INTO maxid FROM google_places;
    maxid := maxid + 10;
    RAISE NOTICE 'maxid: %', maxid;
    LOOP
      UPDATE some_table t1
      SET some_column = ...
      FROM another_table t2
      WHERE ...

YanhaoYang

package main

import (
        "fmt"
)

type A struct {
        S1 string
}

YanhaoYang

package main

import (
	"fmt"
	"testing"
)

func BenchmarkAppendFloat(b *testing.B) {
	benchmarks := []int{10, 100, 1000, 10000, 1e5}
	for _, bm := range benchmarks {

YanhaoYang

// https://play.golang.org/p/CpPW7CxYBV

package main

import (
	"fmt"
)

type A struct {
	X string

YanhaoYang

# fix keyboard
echo 0 > /sys/module/hid_apple/parameters/iso_layout

# prevent wakeup from usb
echo XHC1 > /proc/acpi/wakeup

exit 0

YanhaoYang

package main

import (
	"fmt"
)

type A struct{}

func (A) hi() string {
	return "hi A"