I think the minimum path from no prior knowledge is 12-18 months worth of concentrated study on the topics you mention above. A code school is a good option to structure that time and accelerate learning, if you pick a good one. Starting out with a month or two of self-study would be a smart way to see if this is really for you, before investing in technical training. It is possible to teach yourself, but your odds go up if you are in a cirriculum built with the end goal of getting you the job you want.
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I think the minimum path from no prior knowledge is 12-18 months worth of concentrated study on the topics you mention above. A code school is a good option to structure that time and accelerate learning, if you pick a good one. Starting out with a month or two of self-study would be a smart way to see if this is really for you, before investing in technical training. It is possible to teach yourself, but your odds go up if you are in a cirriculum built with the end goal of getting you the job you want.