Does golang have lambda expressions?

There are no lambda expressions in Go, but anonymous functions provide similar functionality: anonymous functions have no names, are directly embedded in the code, and are declared using the func keyword. Anonymous functions can be passed to other functions or used as callbacks, similar to lambda expressions. Anonymous functions cannot be used as expressions or capture external variables, unlike lambda expressions.

Lambda expressions in Go

There is no explicit syntax for lambda expressions in the Go language, but it provides Anonymous functions behave like lambda expressions.

Anonymous function

Anonymous function is a function without a name that can be embedded directly into the code. They are declared using the func keyword as follows:

<code class="go">func(parameters) (return types) {
  // 函数体
}</code>

For example:

<code class="go">sum := func(a, b int) int {
    return a + b
}</code>

Anonymous function as Lambda expression

Anonymous functions can be used as lambda expressions because they can be passed to other functions and used as callbacks. Here are some examples:

• Slice ordering:

<code class="go">sort.Slice(numbers, func(i, j int) bool {
    return numbers[i] < numbers[j]
})</code>

• Mapped slices:

<code class="go">mappedNumbers := map(numbers, func(n int) int {
    return n * 2
})</code>

Differences from Lambda expressions

Although anonymous functions provide functionality similar to lambda expressions in Go, they have some key differences:

• Anonymous functions cannot be used as expressions, which means they cannot be passed directly as arguments to other functions.
• Anonymous functions cannot capture external variables, but lambda expressions can.

Conclusion

Anonymous functions in Go provide functionality similar to lambda expressions, allowing developers to create concise and reusable blocks of code. While they differ in some ways, they provide Go developers with an efficient way to approach functional programming tasks.

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