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Bookmark or Share- javascript - When should I use ?? (nullish coalescing) vs || (logical ...) in JavaScript only considers null or undefined as "nullish" values. If the left-hand side is any other value, even falsy values like "" (empty string), 0 , or false , it will not use the right-hand side:
- Which equals operator (== vs ===) should be used in JavaScript ...JavaScript has two sets of equality operators: === and !==, and their evil twins == and !=. The good ones work the way you would expect. The good ones work the way you would expect. If the two operands are of the same type and have the same value, then === produces true and !== produces false .
- What is the purpose of the dollar sign in JavaScript?Unlike many similar languages, identifiers (such as functional and variable names) in Javascript can contain not only letters, numbers and underscores, but can also contain dollar signs. They are even allowed to start with a dollar sign, or consist only of a dollar sign and nothing else. Thus, $ is a valid function or variable name in Javascript.
- javascript - Regular expression for only characters a-z, A-Z - Stack ...I don't know how to create a regular expression in JavaScript or jQuery. I want to create a regular expression that will check if a string contains only characters between a-z and A-Z with any arrangement. EDIT. When I tried to make regex /^[a-zA-Z\s]+$/ to accept white spaces as well. It is not working. What could be the mistake?
- What does ${} (dollar sign and curly braces) mean in a string in ...I haven't seen anything here or on MDN. I'm sure I'm just missing something. There's got to be some documentation on this somewhere.
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