Javascript: the module pattern

The module pattern is defined by two things.

1-An outter wrapping function

2-An returned object containing at least one function

It was initially introduced a decade ago by Douglas Crockford in order to provide encapsulation, therefore exposing only what is needed, reducing the risk users would access, undocumented features.

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React JS Patterns

React JS is always evolving, and evolving quickly. These evolutions can be very significant ones, for example, the addition of hooks. React has a lot of code patterns, often these patterns are motivated by the DRY and/or the open-close principle. These patterns sometimes come in to replace a previous one, yet the previous ones still stays in use, as a consequence, the list of patterns keep growing. The goal of the next few posts will be to list the patterns commonly used in React JS developpement. Some patterns are more specific to JSX and I will start with these, and maybe add patterns specific to Redux.

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These Rxjs combination operators are handy to make Rest calls in parallel and combine their results. Both take n observables and will return the results, with the difference that forkJoin will complete even if one of the nested observables errors of completes.

Javascript: Closure and Lexical Scope

The two are separate topics, I just happen to put them in the same post for now. Closure Closure is the capability to remember it's lexical scope, even when executed outside it's lexical scope. If two inner functions, are within the same scope, they share the same closure. Lexical scope The lexical scope is the scope in which a variable is declared during the first pass of the javascript compilation, which has two passes, compilation and execution. During the compilation pass, the compiler goes through the code looking for formal declaration, that is, var, function and parameters of function. For each of these formal declarations, the compiler will check the current lexical scope, and add this identifier if it isn't already there. Then at the second pass, execution, the compiler will run the code as we are intuitively use to and once it reaches the the identifiers found earlier, will ask if they are left hand side(RHS), or right hand side (LHS). If th

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