People often use the term right away or immediately. The word is usually used when someone meant to do something instantly. This usually comes with phrases like, " I will do it right away", Make sure you take that bag to the shop right away and so forth. Another phrase used in place of " right away is " Straight away" for instance, The woman took her car keys straight away!, he dashed into my room straight away, etc.
Straight defines something you do without hesitation. Once, I saw this daily prompt, I started typing straight away