operator 1

package main

var x, y = true, false

func o(b bool) bool {
	print(b)
	return !b
}

func main() {
	_ = x || o(x)
	_ = y && o(y)
}

Choices:

• true
• false
• truefalse
• (It prints nothing)

Answer: (It prints nothing)

Run it on Go play.

Key points:

• When evaluating a || b, the expression a is evaluated firstly and the expression b will be only evaluated if a is evaluated as false.
• When evaluating a && b, the expression a is evaluated firstly and the expression b will be only evaluated if a is evaluated as true.

• slice: 1, 2, 3
• map: 1
• channel: 1
• loop: 1, 2, 3, 4
• switch: 1
• defer: 1, 2
• panic/recover: 1, 2
• reflect: 1, 2
• const: 1, 2, 3
• operator: 1, 2, 3
• function call: 1
• scope: 1, 2
• nil: 1
• embedding: 1

(more are coming ...)