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What is the necessity to have API?

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What is the necessity to have API? (a) Guide to performing activities (b) Describe particular task (c) Both performing activities and Describe particular task (d) Rearrangement of tasks I have been asked this question in an interview for job. Enquiry is from HTML APIs topic in portion Caching, Debugging and Animation of JavaScript Select the correct answer from above options JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

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The correct answer is (b) Describe particular task To elaborate: In computer programming, an application programming interface is a set of subroutine definitions, communication protocols, and tools for building software. An API may describe the ways in which a particular task is performed.

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