Dashes meaning

It dashes at once into the middle of the subjects with the examination of a problem which had baffled the ancients, and seems as if it were tossed at the heads of the French geometers as a challenge.

I always need the correct code for em dashes.

I see where the breeze dashes across it by the streaks or flakes of light.

Seeing clearly that his want of an efficient cavalry precluded all ideas of a resolute offensive in his old style, he determined to limit himself to a defence of the line of the Elbe, making only dashes of a few days' duration at any target the enemy might present.

Sure, early generations of cellular phones had games, but they were like the earliest console video games, little more than dots and dashes.