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      "source": [
        "# Searching Strings\n",
        "\n",
        "Watch the full [C# 101 video](https://www.youtube.com/watch?v=JL30gSE3WaQ&list=PLdo4fOcmZ0oVxKLQCHpiUWun7vlJJvUiN&index=4) for this module."
      ]
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      "source": [
        "## Contains\n",
        "\n",
        "Does your string contain another string within it? You can use `Contains` to find out!\n",
        "The `Contains` method returns a *boolean*. That's a type represented by the keyword `bool` that can hold two values: `true` or `false`. In this case, the method returns `true` when sought string is found, and `false` when it's not found.\n",
        "> Run the following code.\n",
        ">\n",
        "> What else would or wouldn't be contained?\n",
        ">\n",
        "> Does case matter?\n",
        ">\n",
        "> Can you store the return value of the `Contains` method> Remember the type of the result is a `bool`."
      ]
    },
    {
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      "execution_count": null,
      "metadata": {
        "dotnet_interactive": {
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      "outputs": [
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          "name": "stdout",
          "output_type": "stream",
          "text": [
            "True\r\n",
            "False\r\n"
          ]
        }
      ],
      "source": [
        "string songLyrics = \"You say goodbye, and I say hello\";\n",
        "Console.WriteLine(songLyrics.Contains(\"goodbye\"));\n",
        "Console.WriteLine(songLyrics.Contains(\"greetings\"));"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "## StartsWith and EndsWith\n",
        "\n",
        "`StartsWith` and `EndsWith` are methods similar to `Contains`, but more specific. They tell you if a string starts with or ends with the string you're checking. It has the same structure as `Contains`, that is: `bigstring.StartsWith(substring)`\n",
        "> Now you try!\n",
        "> In the following code, try searching the line to see if it starts with \"you\" or \"I\".\n",
        "> Next, see if the code ends with \"hello\" or \"goodbye\"."
      ]
    },
    {
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      "source": [
        "string songLyrics = \"You say goodbye, and I say hello\";"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "# Playground\n",
        "\n",
        "Play around with what you've learned! Here's some starting ideas:\n",
        "> How many lines say hello?\n",
        "> Which lines start with \"You\"?\n",
        "> Which lines end with \"no\"?\n",
        "> Think back to the previous module. Can you make some lines all uppercase and some lines all lowercase?\n",
        "> If you change case, how does that affect `Contains`?"
      ]
    },
    {
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      "outputs": [
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          "name": "stdout",
          "output_type": "stream",
          "text": [
            "Playground\r\n"
          ]
        }
      ],
      "source": [
        "Console.WriteLine(\"Playground\");\n",
        "String line1 = \"You say yes, I say no\";\n",
        "String line2 = \"You say stop and I say go, go, go\";\n",
        "String line3 = \"Oh, no\";\n",
        "String line4 = \"You say goodbye and I say hello\";\n",
        "String line5 = \"Hello, hello\";\n",
        "String line6 = \"I don't know why you say goodbye, I say hello\";"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "# Continue learning\n",
        "\n",
        "There are plenty more resources out there to learn!\n",
        "> [⏩ Next Module - Numbers and Integer Math](https://raw.githubusercontent.com/dotnet/csharp-notebooks/main/csharp-101/04-Numbers%20and%20Integer%20Math.ipynb)\n",
        ">\n",
        "> [⏪ Last Module - The Basics of Strings](https://raw.githubusercontent.com/dotnet/csharp-notebooks/main/csharp-101/02-The%20Basics%20of%20Strings.ipynb)\n",
        ">\n",
        "> [Watch the video](https://www.youtube.com/watch?v=JL30gSE3WaQ&list=PLdo4fOcmZ0oVxKLQCHpiUWun7vlJJvUiN&index=4)\n",
        ">\n",
        "> [Documentation: Intro to C#](https://docs.microsoft.com/dotnet/csharp/tour-of-csharp/tutorials/hello-world?WT.mc_id=csharpnotebook-35129-website)\n",
        ">\n",
        "> [Start at the beginning: What is C#?](https://www.youtube.com/watch?v=BM4CHBmAPh4&list=PLdo4fOcmZ0oVxKLQCHpiUWun7vlJJvUiN&index=1)"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "# Other resources\n",
        "\n",
        "Here's some more places to explore:\n",
        "> [Other 101 Videos](https://dotnet.microsoft.com/learn/videos?WT.mc_id=csharpnotebook-35129-website)\n",
        ">\n",
        "> [Microsoft Learn](https://docs.microsoft.com/learn/dotnet/?WT.mc_id=csharpnotebook-35129-website)\n",
        ">\n",
        "> [C# Documentation](https://docs.microsoft.com/dotnet/csharp/?WT.mc_id=csharpnotebook-35129-website)"
      ]
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