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As a developer, there are situations where the function we create have parameters that might have default values we can. In such situations, JavaScript allows us to define optional parameters to deal with them. These default values are used when we don’t explicitly specify a parameter value. ...
In the above code, the rest syntax is used to “gather” the parameters of the “add” function into an array. “args” is the array holding all the arguments passed during the function call. Now we can use this array to add the values. functionadd(...args){ let sum =0;for(let ...
The example above is a good reason as to why you might want to use default parameters. Here, we don't want the user to see anundefinedvalue. So we will replaceywith a default, meaning we never show this to user. Imagine a similar scenario where we show a user's name. In that exa...
The latest version of JavaScript at the time of writing allows for the use of arrow functions, which can be written with the following syntax: varexample=()=>{// code to execute}example(); Copy The parentheses in either case may contain parameters. When there is only one parameter, t...
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A quick guide to learn how to get query string parameters from the current browser URL by using vanilla JavaScript.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Default_parameters#destructured_parameter_with_default_value_assignment https://www.typescriptlang.org/docs/handbook/2/objects.html#optional-properties https://stackoverflow.com/questions/894860/set-a-default-parameter-value-for...
How to use polyfill in JavaScript - The developers of JavaScript always keep adding new features to the JavaScript language to improve performance and add better functionalities. Sometimes, it happens that new features don’t support by the old browser v
but this approach does not scale well, because we’d need to add a large number of parameters and our code would look pretty bad.Instead, we can use this syntax, with the spread operator (...) followed by the name of the parameter we want to use. Inside the function, the parameter ...