Minecraft: Concept - Double Jumping

Minecraft Double Jumping Concept:
To double "jump" in Minecraft,you need a scoreboard like this
/scoreboard objectives add jump stat.jump

Then after that,make a VERY fast clock then connect it to command blocks with these commands
/tp @a[score_jump_min=1] ~ ~2 ~
/scoreboard players set @a[score_score_jump_min=1] jump 0

HOW IT WORKS:
The pre-prepared scoreboard gives out 1 score when you jump. The first command(/tp) teleports you 2 blocks up ONLY when you jumped so that you can jump 2 blocks up. Then the second command(/scoreboard) sets your jump score back to 0 ONLY if you jumped or have a jump score of 1

Hope you guys understand this tutorial!