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According to Brendan Eich that was the actual reason why with was deprecated, not performance considerations.
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There are thus two problems that the with statement causes: The first argument is the object being bound to. Users of your library may not be able to tell that youve internalized the. To understand why with is deprecated, look at the following example and notice how the function’s argument completely changes how it works. You also have the option of making the object that you want to access a parameter of the IIFE: If you don’t want to expose the temporary variable b to the current scope, you can use an IIFE:
#Javascript for loop var keyword you dont know js code
Synta圎rror: strict mode code may not contain 'with' statementsīest practice: Don’t use a with statement.ĭo use a temporary variable with a short name.Ĭonsole.log("Hello "+b.first+" "+b.last) Example (the braces are optional for single statements, but it is recommended to add them): Introduces the properties of object as local variables in statement. code to check if a value exists in an array using javascript for loop var fruitsarr. This post explains how the with statement works in JavaScript and why its use is discouraged. We then also look at its implementation in Javascript and jQuery.