[Redux] Expected the reducer to be a function
If you see Error: Expected the reducer to be a function.
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This sample shows that how to define a custom HTML docuemnt using window.customElements.
[JS] Check string contains numberic characters
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[JS] Object Copy
Object.assign(target, source) returns copied object from source object.
[JS] Lexical Scope with IIFE
Case 1. var the variable is not hoisting outside of IIFE scope.