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Despite the word "java" in the name, JavaScript is a different language than Java, albeit with some similarities.
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A JavaScript program is written directly into the HTML page, and is executed by the JavaScript intrepeter, so also executes dynamic web page content in the browser window.
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JavaScript is special purpose - it is an object-based language that deals directly with browser entities such as windows, textfields, forms, frames and documents.
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JavaScript can respond to browser events such as mouse clicks and user-typed text.
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JavaScript is easy and fast to write, but not as powerful as Java.
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Client side with dynamic HTML, JavaScript can be more effective than Java
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