This question already has answers here:
What does this symbol mean in JavaScript?
(1 answer)
What does this `…${…}…` code in the node docs mean? [duplicate]
(1 answer)
Closed 5 years ago.
I'm a bit of a beginner still and keep coming across this in code:
${Math.round(newProps.percent)}% surrounded by backticks
or
${currentBillingStartDate} surrounded by backticks and not using the percent.
I'd like to understand when it should be used and why.
The percent sign is just a character that is meant to be interpolated with the expression inside the ${variable}. The result would be a string that looks like "55%"
Related
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What's going on in this piece of Javascript?
(1 answer)
What is instance.constructor.constructor and how does it work?
(1 answer)
How is this function created? A = (0)['constructor']['constructor']
(1 answer)
Obfuscated Javascript in an exploit kit using Array's constructor
(2 answers)
Clever JavaScript to bypass eval method [duplicate]
(1 answer)
Closed 1 year ago.
I am involved in Application security and often times I've used
{{constructor.constructor('alert(1)')()}}
blindly in AngularJS applications to escape the sandbox in older versions. Recently I've been trying to understand what this really means and how it works. I tried reading about object constructors and understand that an object constructor points to the object type. so for example.
var a = new String;
console.log(a.constructor);
will print out String and if I do a.constructor.constructor this will print out {}
Now my question is how does object.constructor.constructor('ANY FUNCTION HERE')() lead to that function being executed in javascript
This question already has an answer here:
Learning Regular Expressions [closed]
(1 answer)
Closed 3 years ago.
I'm not sure what the code below means. I know how to use match, but I'm not sure on what the brackets and "^" signs mean. Is there a website to where I can understand what all you can do with match?
var imagesURL;
imagesURL = html.match(/CapImg[^"']*/g);
match is usually used along with RegExp to search through a data for a particular value or pattern of values. ..
You should rather go and read about JavaScript RegExp (or Regular Expression).
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
This question already has answers here:
Match only unicode letters
(3 answers)
Closed 4 years ago.
I have this PHP regex:
/^[\p{L}\p{M}]+[\p{L}\p{M}\-\s]*$/u
and I want to convert it to jQuery. I tried multiple solutions that I found online, but nothing really worked. I tried using
new RegExp("/^[\p{L}\p{M}]+[\p{L}\p{M}\-\s]*$/u");
but that didn't help.
This is because \p{L} and \p{M} don't exist in the JavaScript RegEx engine. This answer provides solutions for matching Unicode categories: https://stackoverflow.com/a/26659285/1920035
This question already has answers here:
How to avoid scientific notation for large numbers in JavaScript?
(27 answers)
Closed 8 years ago.
Sometimes numbers are displayed like this: 7.92436555894648e+29. How can I display them in full?
Alright, I got it. I'll use a third-party BigNumber library. Thanks.
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Are double and single quotes interchangeable in JavaScript?
(23 answers)
Closed 9 years ago.
If there is an difference, if I use " or ' in javascript or html?
Till now I was coding in php and java only and now I don't know, if I can use ' only or do I have to use ".
I know a bit stupid question, but it makes me confuse, since I am used to ' syntex instead of ".
In JavaScript and in HTML, choosing single vs. double quotes is style preference–there is no functional difference like there is in PHP. Commas in JavaScript serve the same purpose as in PHP plus they can be used in expressions.