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An underscore prepends the method like this: `_.filter.`\n\n## Express.js\n\nExpress.js is a minimal and flexible Node.js web application framework. It simplifies development and reduces repetitive code.\n\n## JavaScript Promises\n\nPromise object is used for asynchronous successes and failures. A promise can have the state of being fulfilled, rejected or pending. A promise takes in one argument, a callback with the two parameters of resolve and reject, and performs something within the callback that invokes the parameters.\n\n## Scope\n\nScope is the context of your code dependent upon whether a variable is declared inside or outside a function. Scope can either be global or local.\n\nLexical Scope is when a function is within another function and the inner function has access to the scope of the outer function. (aka: Static Scope)\n\n## Scope Chains\n\nScope chains establish the scope for a given function by determining nested scopes and what scope is associated with what function. The scope chain starts at the innermost scope and works its way outwards.\n\n## Closures\n\nClosures are created when a function is within another function and the inner function has access to the outer function's variables and parameters. A closure has three scope chains: access to its own scope, access to the outer function's variables, and access to the global variables.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fswanie21%2Fmodule-3-prework","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fswanie21%2Fmodule-3-prework","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fswanie21%2Fmodule-3-prework/lists"}