Js Function Optional Parameter

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Js Function Optional Parameter

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JS Guide

By definition an Optional Parameter is a handy feature that enables programmers to pass less number of parameters to a function and assign a default value Firstly let us first understand what the word Optional Parameter means Parameters are the names listed in the function definition When you're using JavaScript functions, there are two types of parameters: mandatory parameters and optional parameters. In the case of mandatory parameters, you must pass those parameters, otherwise JavaScript throws an error. In the case of optional parameters, though, if you don't pass them they will be initialized to a default value.

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Js Function Optional ParameterYou can also replace undefined by the type of the argument you expect to receive, like this: function myFunc () { arguments = __ ( {requiredArg: Number, optionalArg: [String: 'defaultValue'}) //do stuff, using arguments.requiredArg and arguments.optionalArg // to access your arguments } No longer maintained. Try it Syntax js function fnName param1 defaultValue1 paramN defaultValueN Description In JavaScript function parameters default to undefined However it s often useful to set a different default value This is where default parameters can help

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