The structure of java script program

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Explain the structure of java script program. Write a Java Script using for loop for displaying sum of first 150 numbers. Explain the syntax of function in java script with example.

Define AngularJS and what are its key features? What are AngularJS directives?

What are the 3 types of e-commerce? What is a common challenge of e-commerce?  Tell us which different sector e-commerce applications are available in the market?