| Variables |
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| • | Names
in programming are identifiers |
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| • | The
things they name are their values |
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| The
package -- identifier & value -- is a |
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| variable,
implying a possible change |
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| • | Identifiers have a specific structure in every |
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| programming language |
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| • | JS: letters, digits, _ start
with letter, case sen. |
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| X x
textOut MI5 long_variables_are_OK rate |
| hypens-not-OK 007
no spaces end |