Array.prototype.copyWithin()
Array.prototype.copyWithin() is a JavaScript method in the Array category. Shallow copies part of an array to another location. The syntax is array.copyWithin(target, start, end). A typical example: [1, 2, 3, 4].copyWithin(0, 2) // [3, 4, 3, 4]. A close sibling is Array.prototype.map(), which creates a new array populated with the results of calling a provided function on every element. A close sibling is Array.prototype.filter(), which creates a new array with all elements that pass the test implemented by the provided function. A close sibling is Array.prototype.reduce(), which executes a reducer function on each element, resulting in a single output value. A close sibling is Array.prototype.forEach(), which executes a provided function once for each array element. More about this category: Array methods for manipulating arrays — map, filter, reduce, find, and more. Related Array methods: Array.prototype.map(), Array.prototype.filter(), Array.prototype.reduce(), Array.prototype.forEach(), Array.prototype.find(), Array.prototype.findIndex(), Array.prototype.findLast(), Array.prototype.some().