variables

How can I check if an element exists in the visible DOM?

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It seems some people are landing here, and simply want to know if an element exists (a little bit different to the original question). That’s as simple as using any of the browser’s selecting method, and checking it for a truthy value (generally). For example, if my element had an id of “find-me”, I could … Read more

How to interpolate variables in strings in JavaScript, without concatenation?

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You can take advantage of Template Literals and use this syntax: `String text ${expression}` Template literals are enclosed by the back-tick (` `) (grave accent) instead of double or single quotes. This feature has been introduced in ES2015 (ES6). Example var a = 5; var b = 10; console.log(`Fifteen is ${a + b}.`); // “Fifteen … Read more

How to add elements to an empty array in PHP?

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Both array_push and the method you described will work. $cart = array(); $cart[] = 13; $cart[] = 14; // etc //Above is correct. but below one is for further understanding $cart = array(); for($i=0;$i<=5;$i++){ $cart[] = $i; } echo “<pre>”; print_r($cart); echo “</pre>”; Is the same as: <?php $cart = array(); array_push($cart, 13); array_push($cart, 14); … Read more

Define a global variable in a JavaScript function

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As the others have said, you can use var at global scope (outside of all functions and modules) to declare a global variable: <script> var yourGlobalVariable; function foo() { // … } </script> (Note that that’s only true at global scope. If that code were in a module — <script type=”module”>…</script> — it wouldn’t be at global … Read more

Capturing multiple line output into a Bash variable

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Actually, RESULT contains what you want — to demonstrate: echo “$RESULT” What you show is what you get from: echo $RESULT As noted in the comments, the difference is that (1) the double-quoted version of the variable (echo “$RESULT”) preserves internal spacing of the value exactly as it is represented in the variable — newlines, … Read more

PHP | define() vs. const

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As of PHP 5.3 there are two ways to define constants: Either using the const keyword or using the define() function: const FOO = ‘BAR’; define(‘FOO’, ‘BAR’); The fundamental difference between those two ways is that const defines constants at compile time, whereas define defines them at run time. This causes most of const‘s disadvantages. … Read more

What is the purpose of the single underscore “_” variable in Python?

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_ has 3 main conventional uses in Python: To hold the result of the last executed expression in an interactive interpreter session (see docs). This precedent was set by the standard CPython interpreter, and other interpreters have followed suit For translation lookup in i18n (see the gettext documentation for example), as in code like raise … Read more

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