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The [[dialect|triple script dialect]] includes <code>typeof</code> expressions. |
The [[dialect|triple script dialect]] includes <code>typeof</code> expressions. |
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Unlike ECMA-262, <code>typeof</code> the righthand side must be parenthesized. E.g. <code>typeof <var>foo</var></code> is an error, but <code>typeof(<var>foo</var>)</code> is not. |
Unlike ECMA-262, when using <code>typeof</code> the righthand side must be parenthesized. E.g. <code>typeof <var>foo</var></code> is an error, but <code>typeof(<var>foo</var>)</code> is not. |
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NB: The result of a <code>typeof</code> expression is a string, and there is no need to use [[triple equals]] when checking the result. In fact, <strong>it is an error to check a <code>typeof</code> expression with triple equals</strong>. |
NB: The result of a <code>typeof</code> expression is a string, and there is no need to use [[triple equals]] when checking the result. In fact, <strong>it is an error to check a <code>typeof</code> expression with triple equals</strong>. |
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Revision as of 19:42, 22 June 2020
The triple script dialect includes typeof expressions.
Unlike ECMA-262, when using typeof the righthand side must be parenthesized. E.g. typeof foo is an error, but typeof(foo) is not.
NB: The result of a typeof expression is a string, and there is no need to use triple equals when checking the result. In fact, it is an error to check a typeof expression with triple equals.