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Jun 7, 2011 · Actually ternary is the type of operator (i.e. it has 3 parts). The name of that specific ternary operator is the conditional operator. There just happens to only be one ternary operator in JS so the terms get misused. –
Dec 11, 2008 · The === operator is called a strict comparison operator, it does differ from the == operator. Lets take 2 vars a and b. For "a == b" to evaluate to true a and b need to be the same value. In the case of "a === b" a and b must be the same value and also the same type for it to evaluate to true. Take the following example
Objects are true, but the undefined value and null are both false. The double negation operator !! calculates the truth value of a value. It's actually two operators, where !!x means !(!x), and behaves as follows: If x is a false value, !x is true, and !!x is false. If x is a true value, !x is false, and !!x is true.
In short, when you care that let a variable assigned from a possible null undefined source, and you wish to provide a default value to the variable, use the nullish coalescing operator ??. If you want to avoid messing yourself around with the JavaScript definition of falsy truthy [1], then avoid using ||.
Jul 23, 2014 · As all of the other answers have already said, it's part of ES2015 arrow function syntax. More specifically, it's not an operator, it's a punctuator token that separates the parameters from the body: ArrowFunction : ArrowParameters => ConciseBody. E.g. (params) => { /* body */ }.
To determine whether two boolean values put together are true or false, if you want to check them both (like validation on the web page), you may use the & operator. & is bitwise AND. With the && operator, once it finds the first value is false, it will end evaluation and not to check the second value.
10 % 3 // = 1 ; because 3 * 3 gets you 9, and 10 - 9 is 1. Apparently it is not the same as the modulo operator entirely. You can fit 3 exactly 3 times in 9. If you would add 3 one more time to 9, you would end up with 12. But you were dividing 10, so instead you say it's 3 times 9 with the remainder being 1.
Mar 29, 2022 · 1. "Using the dollar sign is not very common in JavaScript, but professional programmers often use it as an alias for the main function in a JavaScript library. In the JavaScript library jQuery, for instance, the main function $ is used to select HTML elements. In jQuery $("p"); means "select all p elements".
Oct 27, 2013 · FYI paper.js solves this issue by creating PaperScript, a self-contained, scoped javascript with operator overloading of vectors, which it then processing back into javascript. But the paperscript files need to be specifically specified and processed as such.
The boolean operators in JavaScript can return an operand, and not always a boolean result as in other languages. The Logical OR operator (||) returns the value of its second operand, if the first one is falsy, otherwise the value of the first operand is returned. For example: "foo" || "bar"; // returns "foo".
