{"id":61,"date":"2025-03-25T03:04:51","date_gmt":"2025-03-25T03:04:51","guid":{"rendered":"https:\/\/techkubo.com\/go\/?p=61"},"modified":"2025-05-26T17:47:24","modified_gmt":"2025-05-26T17:47:24","slug":"go-arrays","status":"publish","type":"post","link":"https:\/\/techkubo.com\/go\/go-arrays\/","title":{"rendered":"Go Arrays"},"content":{"rendered":"\n

In Go, arrays are designed to store multiple values of the same type within a single variable. This feature allows developers to work efficiently without the need for creating multiple variables for related data.<\/p>\n\n\n\n

How to Declare Arrays<\/h2>\n\n\n\n

Arrays in Go can be declared using two primary methods:<\/p>\n\n\n\n

    \n
  1. Using the var<\/code> keyword<\/strong>: var arrayName = [length]dataType{values} \/\/ Fixed length var arrayName = [...]dataType{values} \/\/ Length inferred<\/code><\/li>\n\n\n\n
  2. Using shorthand with :=<\/code><\/strong>: arrayName := [length]dataType{values} \/\/ Fixed length arrayName := [...]dataType{values} \/\/ Length inferred<\/code><\/li>\n<\/ol>\n\n\n\n

    Note:<\/strong><\/em> The length of an array is always fixed in Go. It can be explicitly stated as a number or inferred automatically by the compiler based on the number of values.<\/p>\n\n\n\n

    Examples of Arrays in Go<\/h2>\n\n\n\n

    Example 1: Declaring Arrays with Fixed Length<\/strong><\/p>\n\n\n\n

    package main\nimport ("fmt")\n\nfunc main() {\n  var motorcycleModels = [3]string{"Ducati", "Yamaha", "Honda"}\n  brands := [4]string{"Suzuki", "Honda", "Yamaha", "Ducati"}\n\n  fmt.Println(motorcycleModels)\n  fmt.Println(brands)\n}\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Output:<\/strong><\/p>\n\n\n\n
    [Ducati Yamaha Honda]\n[Suzuki Honda Yamaha Ducati]\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Example 2: Declaring Arrays with Inferred Length<\/strong><\/p>\n\n\n\n
    package main\nimport ("fmt")\n\nfunc main() {\n  var motorcycleModels = [...]string{"Ducati", "Yamaha", "Honda"}\n  brands := [...]string{"Suzuki", "Honda", "Yamaha", "Ducati"}\n\n  fmt.Println(motorcycleModels)\n  fmt.Println(brands)\n}\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Output:<\/strong><\/p>\n\n\n\n
    [Ducati Yamaha Honda]\n[Suzuki Honda Yamaha Ducati]\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Example 3: Array of Integers<\/strong><\/p>\n\n\n\n
    package main\nimport ("fmt")\n\nfunc main() {\n  var motorcycleYears = [5]int{2019, 2020, 2021, 2022, 2023}\n  fmt.Println(motorcycleYears)\n}\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Output:<\/strong><\/p>\n\n\n\n
    [2019 2020 2021 2022 2023]\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Accessing Array Elements<\/h2>\n\n\n\n
    To access a specific element in an array, simply use its index. Array indexing begins at 0<\/code>.<\/p>\n\n\n\n
    Example:<\/strong><\/p>\n\n\n\n
    package main\nimport ("fmt")\n\nfunc main() {\n  prices := [3]int{25000, 30000, 35000}\n  fmt.Println(prices[0]) \/\/ Access first element\n  fmt.Println(prices[2]) \/\/ Access third element\n}\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Output:<\/strong><\/p>\n\n\n\n
    25000\n35000\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Modifying Array Elements<\/h2>\n\n\n\n
    It is also possible to change an element within an array by referring to its index.<\/p>\n\n\n\n
    Example:<\/strong><\/p>\n\n\n\n
    package main\nimport ("fmt")\n\nfunc main() {\n  prices := [3]int{25000, 30000, 35000}\n  prices[2] = 40000 \/\/ Modify the third element\n  fmt.Println(prices)\n}\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Output:<\/strong><\/p>\n\n\n\n
    [25000 30000 40000]\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Array Initialization Defaults<\/h2>\n\n\n\n
    When an array or one of its elements is not explicitly initialized, Go assigns a default value based on the data type. For example, the default for integers is 0<\/code>, and for strings, it is \"\"<\/code>.<\/p>\n\n\n\n
    Example:<\/strong><\/p>\n\n\n\n
    package main\nimport ("fmt")\n\nfunc main() {\n  brands := [5]string{} \/\/ Default initialization\n  years := [5]int{2020, 2021} \/\/ Partially initialized\n  models := [5]string{"Ducati", "Yamaha", "Honda", "Suzuki", "BMW"} \/\/ Fully initialized\n\n  fmt.Println(brands)\n  fmt.Println(years)\n  fmt.Println(models)\n}\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Output:<\/strong><\/p>\n\n\n\n
    ["" "" "" "" ""]\n[2020 2021 0 0 0]\n[Ducati Yamaha Honda Suzuki BMW]\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Initializing Specific Elements Only<\/h2>\n\n\n\n
    Go allows you to initialize specific elements in an array by specifying index-value pairs.<\/p>\n\n\n\n
    Example:<\/strong><\/p>\n\n\n\n
    package main\nimport ("fmt")\n\nfunc main() {\n  years := [5]int{2:2018, 4:2020} \/\/ Initialize specific elements\n  fmt.Println(years)\n}\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Output:<\/strong><\/p>\n\n\n\n
    [0 0 2018 0 2020]\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Finding the Array Length<\/h2>\n\n\n\n
    The len()<\/code> function is available to calculate the length of an array.<\/p>\n\n\n\n
    Example:<\/strong><\/p>\n\n\n\n
    package main\nimport ("fmt")\n\nfunc main() {\n  motorcycleBrands := [4]string{"Ducati", "Yamaha", "Honda", "Suzuki"}\n  releaseYears := [...]int{2018, 2019, 2020, 2021, 2022}\n\n  fmt.Println(len(motorcycleBrands))\n  fmt.Println(len(releaseYears))\n}\n<\/pre><\/div>\n\n\n\n
    <\/p>\n\n\n\n
    Output:<\/strong><\/p>\n\n\n\n
    4\n5\n<\/pre><\/div>\n\n\n\n
    <\/p>\n","protected":false},"excerpt":{"rendered":"
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