main.go 源码
// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
package main
// ---------------------------------------------------------
// EXERCISE: Slicing the Housing Prices
//
// We have received housing prices. Your task is to print only the requested
// columns of data (see the expected output).
//
// 1. Separate the data by the newline ("\n") -> rows
//
// 2. Separate each row of the data by the separator (",") -> columns
//
// 3. Find the from and to positions inside the columns depending
// on the command-line arguments.
//
// 4. Print only the requested column headers and their data
//
//
// RESTRICTIONS
//
// + You should use slicing when printing the columns.
//
//
// EXPECTED OUTPUT
//
// go run main.go
// Location Size Beds Baths Price
//
// New York 100 2 1 100000
// New York 150 3 2 200000
// Paris 200 4 3 400000
// Istanbul 500 10 5 1000000
//
//
// go run main.go Location
// Location Size Beds Baths Price
//
// New York 100 2 1 100000
// New York 150 3 2 200000
// Paris 200 4 3 400000
// Istanbul 500 10 5 1000000
//
//
// NOTE : Finds the position of the Size column and slices the columns
// appropriately.
//
// go run main.go Size
// Size Beds Baths Price
//
// 100 2 1 100000
// 150 3 2 200000
// 200 4 3 400000
// 500 10 5 1000000
//
//
// NOTE : Finds the positions of the Size and Baths columns and
// slices the columns appropriately.
//
// go run main.go Size Baths
// Size Beds Baths
//
// 100 2 1
// 150 3 2
// 200 4 3
// 500 10 5
//
//
// go run main.go Beds Price
// Beds Baths Price
//
// 2 1 100000
// 3 2 200000
// 4 3 400000
// 10 5 1000000
//
//
// Note : It works even if the given column name does not exist.
//
// go run main.go Beds NotExist
// Beds Baths Price
//
// 2 1 100000
// 3 2 200000
// 4 3 400000
// 10 5 1000000
//
//
// go run main.go NotExist NotExist
// Location Size Beds Baths Price
//
// New York 100 2 1 100000
// New York 150 3 2 200000
// Paris 200 4 3 400000
// Istanbul 500 10 5 1000000
//
//
// Note : It works even if the Price's index > Size's index
//
// In that case, it resets the invalid starting position to 0.
//
// But it still uses the Size column.
//
// go run main.go Price Size
// Location Size
//
// New York 100
// New York 150
// Paris 200
// Istanbul 500
//
//
// HINTS
//
// + strings.Split function can separate a string into a []string
//
// ---------------------------------------------------------
func main() {
const (
data = `Location,Size,Beds,Baths,Price
New York,100,2,1,100000
New York,150,3,2,200000
Paris,200,4,3,400000
Istanbul,500,10,5,1000000`
separator = ","
)
}
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