| 1. 9. 3. Naming Variables |
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The first character of the name must be a letter or an underscore (_). |
All characters following the first character can be letters, underscore, or digits. |
Letters can be either upper or lowercase. |
JavaScript does distinguish between the two cases. |
All the following variable names are legal: |
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var test;
var $test;
var $1;
var _$te$t2;
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