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The spread operator allows us to spread the value of an array (or any iterable) across zero or more arguments in a function or elements in an array (or any iterable). The rest parameter allows us to pass an indefinite number of parameters to a function and access them in an array.

What is the spread operator? In JavaScript, spread syntax refers to the use of an ellipsis of three dots ( ? ) to expand an iterable object into the list of arguments. The spread operator was added to JavaScript in ES6 (ES2015), just like the rest parameters, which have the same syntax: three magic dots ? .

The Spread operator allows an iterable to expand in places where 0+ arguments are expected. It is mostly used in the variable array where there is more than 1 value is expected. It allows us the privilege to obtain a list of parameters from an array.

Rest Parameter collects all remaining elements into an array. Spread Operator expands collected elements such as arrays into single elements.

Spread operators expand an array into parameters. But the Rest operator does the opposite, it collects the parameters and turns them into an array. We can include in this in function definition just by using three dots(?) followed by the name of the array that will contain them.

We can use the spread operator to conditionally spread arrays into another array. Then items is [?foo?, ?bar?] since we have a ternary express that has false as the value of the conditional part of the ternary expression. If it's true , then the left array is spread into items .

Conditionally Add to Objects & Arrays in JavaScript - YouTube YouTube Start of suggested clip End of suggested clip And we can do the same with a faulty. Value we say faultyvalue n end and add our faultyvalue. AndMoreAnd we can do the same with a faulty. Value we say faultyvalue n end and add our faultyvalue. And you can see that falsie value is no longer added to the object. So we could do this for all of our

Spread Operator is a very simple and powerful feature introduced in the ES6 standard of JavaScript, which helps us to write nicer and shorter code. The JavaScript spread operator is denoted by three dots (?).

Simply put, the spread operator in JavaScript expands or unpacks the elements of an array or iterable object. It can be used to solve a couple of different problems: extracting values from arrays and objects. copying arrays and objects.

The rest parameter syntax allows a function to accept an indefinite number of arguments as an array, providing a way to represent variadic functions in JavaScript.