We can take advantage of this lazy evaluation, and instead of using it inside the IF statement, we can use it as part of an assignment in order to provide a default value in case your expression fails or is undefined : This means that if you have the following IF statement, only the first two expressions will be evaluated: if( expression1 || expression2 || expression3 || expression4)Īssuming expression1 is falsy (i.e it returns a value that is evaluated to false ) and expression2 is truthy (i.e it returns a value that is evaluated to true ) then the evaluation will stop there. In JavaScript (and thus TypeScript as well) the OR logical operator follows a lazy evaluation model, meaning, it’ll return the first expression that returns true and it won’t keep checking for the rest. Notice that the format is the same, the issue here is that if in the future you need to expand one of the sections here (either for when the expression is true or false), you’ll have to turn it into a full-blown IF.ELSE statement. The point of this operator, is to allow you to return a value if the evaluated expression is either null or undefined which is not exactly what the name implies, but oh well. With a name like that, it’s hard to believe it’s not one of the most popular operators in the language, am I right?
#IMPORT SHORTHAND INTO SWIFTTEXT CODE#
So in this article, I want to cover some very useful (and sometimes cryptic) shorthands that you can find both in JavaScript and in TypeScript so you can either use them yourself or at least, have know them in case the person who’s code you’re reading has used them. And the worst part is, that line is not universal, some people would draw it much further than others so when it comes to deciding if a piece of code is legible enough for everyone we tend to stay away from using many shorthands such as ternary operators, on-line arrow functions and whatnot.īut the ugly truth is: sometimes, those shorthands come in very handy and are easy enough that anyone who’s interested enough in reading our code can and will understand them. There is a very fine line between writing clean and efficient code and writing code that only you can read.
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