Easily switch Go versions at the command-line.

switch_go_version.sh

# my amazing colleague @fatih showed me this. saving it here so i don't forget it.
function switchgo() {
  version=$1
  if [ -z $version ]; then
    echo "Usage: switchgo [version]"
    return
  fi
  if ! command -v "go$version" > /dev/null 2>&1; then
    echo "version does not exist, downloading with commands: "
    echo "  go get golang.org/dl/go${version}"
    echo "  go${version} download"
    echo ""
    go get "golang.org/dl/go${version}"
    go${version} download
  fi
  go_bin_path=$(command -v "go$version")
  ln -sf "$go_bin_path" "$GOBIN/go"
  echo "Switched to ${go_bin_path}"
}