The list can also be used to evade some of directive. It should not be used outside of the block in which it is declared.

It contains all of the names that were used with dot notation, subscript notation, and object literals to name the properties of objects. You can copy the rules, and by doing so avoids the errors related to either. A variable should not have the same name as a variable or parameter in an outer function. Assignments are not allowed in expression position, and comparisons are not allowed in statement position. Java Script uses a C-like syntax that requires the use of semicolons to delimit certain statements.

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Avoid those things when there are better options available.

Intelli Sense is a general term for a variety of code editing features including: code completion, parameter info, quick info, and member lists.

Use of global variables is strongly discouraged, but unfortunately web browsers require their use. However, if any of those names are expected to be supplied by other files and those other files fail to do so, then execution errors will result.

It is usually better to use top-level variable declarations instead: directive is used to declare a list of property identifiers that are used in the file.

Space has one clear advantage over tab: there is no reliable standard for how many spaces a tab represents, but it is universally accepted that a space occupies a space. You can edit with tabs if you must, but make sure it is spaces again before you commit.

Maybe someday we will finally get a universal standard for tabs, but until that day comes, the better choice is spaces.The three directives are directive is used to specify a set of globals (usually functions and objects containing functions) that are available to this file.This was commonly used in browsers to link source files together before ES6 modules appeared.Also, preincrement/postincrement confusion can produce off-by-one errors that are extremely difficult to diagnose. It also attempts to resolve visual ambiguities by recommending explicit escapement.Java Script’s syntax for regular expression literals overloads the has a specific set of rules about the use of whitespace.Many of the features that were intended to make the language easy to use are troublesome when projects become complicated. If it finds a problem, it returns a message describing the problem and an approximate location within the source. If they are used, they should be placed in a source file before the first statement.