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The detailed semantics of "the" ternary operator as well as its syntax differs significantly from language to language. A top level distinction from one language to another is whether the expressions permit side effects (as in most procedural languages) and whether the language provides short-circuit evaluation semantics, whereby only the selected expression is evaluated (most standard ...
Google Chrome DevTools, Console tab The "triangle" can be clicked to reveal some hidden info.. Click on the "Console" tab; Scroll to the bottom of the console and look for log entries in yellow and red.
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But it is surprisingly easy to run across cases where these problems occur with perfectly reasonable template calls (especially if there is a "hierarchy" of templates, where one template calls another, passing on the values of its parameters to the parameters of the "lower-level" template—in such cases, one will often end up with defined-but ...
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These are typically built into browsers, in their DevTools window. Debuggers allow you to step debug (go through your JavaScript code line-by-line, hover over variables to see their values, etc.) Firefox - use Tools → JavaScript Console showing all JavaScript and CSS errors. Chrome and Edge - use Tools → Developer Tools.
C does not provide direct support to exception handling: it is the programmer's responsibility to prevent errors in the first place and test return values from the functions.
var x1 = 0; // A global variable, because it is not in any function let x2 = 0; // Also global, this time because it is not in any block function f {var z = 'foxes', r = 'birds'; // 2 local variables m = 'fish'; // global, because it wasn't declared anywhere before function child {var r = 'monkeys'; // This variable is local and does not affect the "birds" r of the parent function. z ...