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Needs

Needs["context`"]
loads an appropriate file if the specified context is not already in $Packages.

Needs["context`", "file"]
loads file if the specified context is not already in $Packages.

MORE INFORMATION

Needs["context`"] calls Get["context`"]. By convention, the file loaded in this way is the one which contains a package that defines context`.

Needs["file`"] typically reads in a file named file.m.

Basic Examples (1)

Read in the file for the Computer Arithmetic Package if it has not already been read:

The commands defined by the package are ready for use:

Get DeclarePackage FileNames

Mathematica Packages

Setting Up Mathematica Packages

Mathematica Expressions in Files

Namespace Management

Package Development

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