Efficiently Initializing boolean Arrays in Go without For Loops
In Go, initializing boolean arrays can be done in a variety of ways. The most straightforward approach involves using a for loop, as in the example provided:
<code class="go">for i := 0; i < n; i++ { A[i] = true }</code>
However, there are alternative methods that can eliminate the need for a for loop.
Creating Zero-Filled Arrays/Slices
By default, Go arrays and slices are initialized with their zero values. For booleans, the zero value is false. Therefore, creating an array or slice without initializing its elements will result in all values being set to false.
<code class="go">b1 := []bool{false, false, false} b2 := [3]bool{false, false, false}</code>
Composite Literals with Constant Values
Composite literals can be used to create and initialize arrays or slices with specific values. However, using composite literals does not provide any significant improvement over using a for loop.
<code class="go">b1 := []bool{true, true, true} b2 := [3]bool{true, true, true}</code>
To abbreviate the initialization, you can introduce a constant for the value true:
<code class="go">const T = true b3 := []bool{T, T, T}</code>
Alternative Strategies
If the efficiency of initializing large boolean arrays is a concern, there are alternative strategies to consider:
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