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What is the purpose of a D Flip-Flop in Minecraft?

Based on the design of the circuit and on the description, what is its purpose?
It says that it transfers the state of D to Q. This means it can store one bit.
But what is the purpose of a D Flip-Flop when I can just put a lever on a block? This also can store one bit.
Question from user Jason at stackexchange.
Answer:
Saying that you can replace D Flip-Flops with a lever on a block is a bit naive. The power of D Flip-Flops becomes apparent when you use many of them, and connect them all to the same clock. You can't possibly toggle half a dozen levers all at the exact same time, but you can effectively do that with D Flip-Flops.
D Flip-Flops form the basis of shift registers, which in turn are a key component in parallel to serial and serial to parallel converters. These probably aren't very useful in Minecraft; using only two redstone lines (clock and data) instead of the parallel bus width doesn't make up for the slow speed of the serial line compared to a parallel bus. At best, we might be able to clock a serial line twice as fast as a parallel line, which is not a high enough speed increase.
Answer from user MBraedley at stackexchange.

Based on the design of the circuit and on the description, what is its purpose?
It says that it transfers the state of D to Q. This means it can store one bit.
But what is the purpose of a D Flip-Flop when I can just put a lever on a block? This also can store one bit.
Question from user Jason at stackexchange.
Answer:
Saying that you can replace D Flip-Flops with a lever on a block is a bit naive. The power of D Flip-Flops becomes apparent when you use many of them, and connect them all to the same clock. You can't possibly toggle half a dozen levers all at the exact same time, but you can effectively do that with D Flip-Flops.
D Flip-Flops form the basis of shift registers, which in turn are a key component in parallel to serial and serial to parallel converters. These probably aren't very useful in Minecraft; using only two redstone lines (clock and data) instead of the parallel bus width doesn't make up for the slow speed of the serial line compared to a parallel bus. At best, we might be able to clock a serial line twice as fast as a parallel line, which is not a high enough speed increase.
Answer from user MBraedley at stackexchange.
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