Get the latest version of Go from golang.org for macOS (tested on amd64)

go-get-latest

#!/usr/bin/env bash
#
# Drop this in your path and make it executable to install the latest
# macOS version of Go from golang.org/dl.

set -Eeuo pipefail

go-get-latest-version-httpie () {
  http -F golang.org/VERSION m==text
}

go-get-latest-package-httpie () {
  local package=$1
  http -q --download golang.org/dl/${package}
}

go-get-latest-version-curl () {
  curl -L "https://golang.org/VERSION?m=text"
}

go-get-latest-package-curl () {
  local package=$1
  curl -sLO "https://golang.org/dl/${package}"
}

cleanup () {
  local package=${1:-}
  if [[ $package != "" ]]; then
    rm -f $1
  fi
  cd -
}

install-latest () {
  cd $TMPDIR
  trap cleanup EXIT
  local arch=$1

  local client=httpie
  if ! http --version >&/dev/null; then
    client=curl
  fi
  
  local version=$(go-get-latest-version-$client)
  [[ -z $version ]] && return 1
  local package=${version}.darwin-${arch}.pkg

  go-get-latest-package-$client "$package" || return 1
  trap "cleanup $package" EXIT
  sudo installer -pkg "$package" -target /
}

arch=amd64
if [[ $(uname -m) != 'x86_64' ]]; then
  arch=arm64
fi

install-latest $arch