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Path	Synopsis
src
andr.io/ch1/ex1_1 Modify the `echo` program to also allow print `os.Args[0]`, the name of the command that invoked it.	Modify the `echo` program to also allow print `os.Args[0]`, the name of the command that invoked it.
andr.io/ch1/ex1_10 Try `fetchall` with longer argument lists, such as samples from the top million web sites available at `alexa.com`.	Try `fetchall` with longer argument lists, such as samples from the top million web sites available at `alexa.com`.
andr.io/ch1/ex1_12 Modify the Lissajous server to read parameter values from the URL.	Modify the Lissajous server to read parameter values from the URL.
andr.io/ch1/ex1_2 Modify the `echo` program to print the index and value of each of its arguments, one per line.	Modify the `echo` program to print the index and value of each of its arguments, one per line.
andr.io/ch1/ex1_3 Experiment to measure the difference in running time between our potentially inefficient versions and the one that uses `strings.Join`.	Experiment to measure the difference in running time between our potentially inefficient versions and the one that uses `strings.Join`.
andr.io/ch1/ex1_4 Modify `dup2` to print the names of all files in which each duplicated line occurs.	Modify `dup2` to print the names of all files in which each duplicated line occurs.
andr.io/ch1/ex1_5 Change the Lissajous program's color palette to green on black, for added authenticity.	Change the Lissajous program's color palette to green on black, for added authenticity.
andr.io/ch1/ex1_6 Modify the Lissajous program to produce images in multiple colors by adding more values to `palette` and then displaying them by changing the third argument of `SetColorIndex` in some interesting way.	Modify the Lissajous program to produce images in multiple colors by adding more values to `palette` and then displaying them by changing the third argument of `SetColorIndex` in some interesting way.
andr.io/ch1/ex1_7 The function call `io.Copy(dst, src)` reads from `src` and writes to `dst`.	The function call `io.Copy(dst, src)` reads from `src` and writes to `dst`.
andr.io/ch1/ex1_8 Modify `fetch` to add the prefix `http://` to each argument URL, if it is missing.	Modify `fetch` to add the prefix `http://` to each argument URL, if it is missing.
andr.io/ch1/ex1_9 Modify `fetch` to also print the HTTP status code, found in `resp.Status`.	Modify `fetch` to also print the HTTP status code, found in `resp.Status`.
andr.io/ch2/ex2_1 Add types, constants, and functions to `tempconv` for processing temperatures in the Kelvin scale, where Kelvin is -273.15°C and a difference of 1K has the same magnitude as 1°C.	Add types, constants, and functions to `tempconv` for processing temperatures in the Kelvin scale, where Kelvin is -273.15°C and a difference of 1K has the same magnitude as 1°C.
andr.io/ch2/ex2_2 Write a general purpose unit-conversion program analogous to `cf` that reads numbers from its command-line arguments or from the standard imput if there are no arguments, and converts each nunber into units like temperature in Celsius and Fahrenheit, length in feet and meters, weight in pounds, kilograms, and the like.	Write a general purpose unit-conversion program analogous to `cf` that reads numbers from its command-line arguments or from the standard imput if there are no arguments, and converts each nunber into units like temperature in Celsius and Fahrenheit, length in feet and meters, weight in pounds, kilograms, and the like.
andr.io/ch2/ex2_2/weightconv Write a general purpose unit-conversion program analogous to `cf` that reads numbers from its command-line arguments or from the standard imput if there are no arguments, and converts each nunber into units like temperature in Celsius and Fahrenheit, length in feet and meters, weight in pounds, kilograms, and the like.	Write a general purpose unit-conversion program analogous to `cf` that reads numbers from its command-line arguments or from the standard imput if there are no arguments, and converts each nunber into units like temperature in Celsius and Fahrenheit, length in feet and meters, weight in pounds, kilograms, and the like.
andr.io/ch2/ex2_3 Rewrite `PopCount` to use a loop instead of a single expression.	Rewrite `PopCount` to use a loop instead of a single expression.
andr.io/ch2/ex2_3/popcount Rewrite `PopCount` to use a loop instead of a single expression.	Rewrite `PopCount` to use a loop instead of a single expression.
andr.io/ch2/ex2_4 Write a version of `PopCount` that counts bits by shifting its argument through 64 bit positions, testing the rightmost bit each time.	Write a version of `PopCount` that counts bits by shifting its argument through 64 bit positions, testing the rightmost bit each time.
andr.io/ch2/ex2_4/popcount Write a version of `PopCount` that counts bits by shifting its argument through 64 bit positions, testing the rightmost bit each time.	Write a version of `PopCount` that counts bits by shifting its argument through 64 bit positions, testing the rightmost bit each time.
andr.io/ch2/ex2_5 The expression `x&(x-1)` clears the rightmost non-zero bit of x.	The expression `x&(x-1)` clears the rightmost non-zero bit of x.
andr.io/ch2/ex2_5/popcount The expression `x&(x-1)` clears the rightmost non-zero bit of x.	The expression `x&(x-1)` clears the rightmost non-zero bit of x.
andr.io/ch3/ex3_1 If the function `f` returns a non-finite `float64` value, the SVG file will contain invalid `<polygon>` elements (although many SVG renderers handle this gracefully).	If the function `f` returns a non-finite `float64` value, the SVG file will contain invalid `<polygon>` elements (although many SVG renderers handle this gracefully).
andr.io/ch3/ex3_10 Write a non-recursive version of `comma`, using `bytes.Buffer` instead of string concatenation.	Write a non-recursive version of `comma`, using `bytes.Buffer` instead of string concatenation.
andr.io/ch3/ex3_11 Enhance `comma` so it deals correctly with floating-point numbers and an optional sign.	Enhance `comma` so it deals correctly with floating-point numbers and an optional sign.
andr.io/ch3/ex3_12 Write a function that reports whether two strings are anagrams of each other, that is, they contain the same letters in a different order.	Write a function that reports whether two strings are anagrams of each other, that is, they contain the same letters in a different order.
andr.io/ch3/ex3_13 Write const declarations for KB, MB, up through YB as compactly as you can.	Write const declarations for KB, MB, up through YB as compactly as you can.
andr.io/ch3/ex3_2 Experiment with vizualizations of other functions from the `math` package.	Experiment with vizualizations of other functions from the `math` package.
andr.io/ch3/ex3_3 Color each polygon based on its height, so that the peaks are colored red (`#ff0000`) and the valleys blue ('#0000ff').	Color each polygon based on its height, so that the peaks are colored red (`#ff0000`) and the valleys blue ('#0000ff').
andr.io/ch3/ex3_4 Following the approach of the Lissajous example in Section 1.7, construct a web server that computes surfaces and writes SVG data to the client.	Following the approach of the Lissajous example in Section 1.7, construct a web server that computes surfaces and writes SVG data to the client.
andr.io/ch3/ex3_5 Implement a full-color Mandelbrot set using the function `image.NewRBA` and the type `color.RGBA` or `color.YCbCr`.	Implement a full-color Mandelbrot set using the function `image.NewRBA` and the type `color.RGBA` or `color.YCbCr`.
andr.io/ch3/ex3_6 Supersampling is a technique to reduce the effect of pixelation by computing the color value at several points within each pixel and taking the average.	Supersampling is a technique to reduce the effect of pixelation by computing the color value at several points within each pixel and taking the average.
andr.io/ch3/ex3_7 Another simple fractal uses Newton's method to find complex solutions to a function such as `z^4-1 = 0`.	Another simple fractal uses Newton's method to find complex solutions to a function such as `z^4-1 = 0`.
andr.io/ch3/ex3_8 Rendering fractals at high zoom levels demands great arithmetic precision.	Rendering fractals at high zoom levels demands great arithmetic precision.
andr.io/ch3/ex3_8/mandelbrot Rendering fractals at high zoom levels demands great arithmetic precision.	Rendering fractals at high zoom levels demands great arithmetic precision.
andr.io/ch3/ex3_9 Write a web server that renders fractals and writes the image data to the client.	Write a web server that renders fractals and writes the image data to the client.
andr.io/ch4/ex4_1 Write a function that counts the number of bits that are different in two SHA256 hashes.	Write a function that counts the number of bits that are different in two SHA256 hashes.
andr.io/ch4/ex4_1/popcount Write a function that counts the number of bits that are different in two SHA256 hashes.	Write a function that counts the number of bits that are different in two SHA256 hashes.
andr.io/ch4/ex4_10 Issues prints a table of GitHub issues matching the search terms and reports the results in age categories of this month, this year, and older than a year.	Issues prints a table of GitHub issues matching the search terms and reports the results in age categories of this month, this year, and older than a year.
andr.io/ch4/ex4_10/github Package github provides a Go API for the GitHub issue tracker.	Package github provides a Go API for the GitHub issue tracker.
andr.io/ch4/ex4_11 Build a tool that lets users create, read, update, and close GitHub i̶s̶s̶u̶e̶s̶ pull requests from the command line, invoking their preferred text editor when substantial text input is required.	Build a tool that lets users create, read, update, and close GitHub i̶s̶s̶u̶e̶s̶ pull requests from the command line, invoking their preferred text editor when substantial text input is required.