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The prototype chain is used by JavaScript engines for reading property resolution.  
The prototype chain is used by JavaScript engines for reading property resolution.  


User-defined [[JavaScript/Notes/Function#Functions_Double_as_Constructor|functions]] can be designed for use as constructors to create new objects which then have, on their prototype chain, that constructor function's `prototype`. Review from [[JavaScript/Notes/Function#Functions_Double_as_Constructor|Functions]]:
User-defined [[JavaScript/Notes/Function#Functions_Double_as_Constructor|functions]] can be designed for use as constructors, to create new objects which then have, on their prototype chain, that constructor function's `prototype`.  
{{Function Constructor}}


Define constructor functions how assigning `prototype` property to the constructor creates the prototype chain, for shared properties on the constructor function's object instances.  
Define constructor functions how assigning `prototype` property to the constructor creates the prototype chain, for shared properties on the constructor function's object instances.  
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