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Many programming languages support the concept of a default argument for a function parameter so that the caller does not always need to specify the argument value. Unfortunately, ES5 does not have a default argument support in its syntax. ES6 functions have come a long way by taking aboard the years of complaints and improving parameter handling that is less error-prone and more powerful.
Flux is the application architecture that Facebook uses for building client-side web applications. It complements React’s composable view components by utilizing a unidirectional data flow. It’s more of a pattern rather than a formal framework.