Your question contains an ambiguity. Do you mean writing down an idea so as not to forget it, or publishing an idea before others publish the same thing (or before the idea becomes obsolete)? Concerning publication of ideas and theories: There is no general rule. History of science shows that sometimes an idea is published nearly in parallel by two or more researchers because the time was ripe for this idea. In other cases, a published idea is ignored or remains unnoted by the community and gets accepted only many years later. It is always wise to publish as soon as possible.

Thank you very much for your reply your response gives more insights into the publication of ideas and theories . I would recommend your perspective. However, I meant writing down ideas so as not to forget it. Like many academic researchers, I tend to see an issue in different views. however, when I delve deeply into one view I forget about others which lets me forget to implement different ideas in my studies. to my way of thinking creative ideas can easily expire if we don't hurry up writing them down. or work on them at least 10%.