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A function in JavaScript is similar to a procedurea set of statements that performs a task or calculates a value, but for a procedure to qualify as a function, it should take some input and return an output where there is some obvious relationship between the input and the output. Introduction to JavaScript Object to String. We often face a situation while coding where we want the object in string format that is a string but we have the value of that object in some other format. Please DO NOT link any questions which don't specifically say "TypeScript" as this question specifically relates to TypeScript. As these methods return promises, they can be chained. There is a naive way to copy objects: its looping through the original one copying every (adeneo's answer only checks "own" properties, tymeJV's does both "own" and prototype). That is, the function body string passed to the Function constructor must be parsed each and every time the constructor is called. 4.5.copy The "copy" operation copies the value at a specified location to the target location. In JavaScript, the RegExp object is a regular expression object with predefined In my Chrome debugger, they effectively result the same kind of object except said difference. If you also want to allow undefined, change the === null to == null.And you may or may not want to add a hasOwnProperty check, depending on whether you care about properties from prototypes. The String object overrides the toString method of Object; it does not inherit Object.prototype.toString(). The JSON object contains methods for parsing JavaScript Object Notation (JSON) and converting values to JSON. Object.freeze() Freezes an object. This is not entirely true. The Title should be a String but I'm receiving a Object Promise. 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