Cloning in javascript means copying object properties to another object so as to avoid creating an object which already exists. The slice() method is used to clone an array.
We will see in the below article regarding the uses of the slice() method on array in javascript. This method is used in many different ways. It can be seen in the statement article.slice(1,3) this means that the given array with name “article” has 5 elements and the indexing starts from 0 in the above statement we can see the start parameter has index 1 and end parameter has the index 3 which says it will select the second and third element from the given array.Īs we know slice() method is used for slicing the part of the given array without changing the original array. Var article = ĭocument.getElementById("arr_slice").innerHTML = heading Įxplanation: In the above program, we can see we are selecting the second and third elements of the given array using the slice() method. Example #1Ĭlick the button below to select the second and the third elements from the array and print. Similarly, if the end parameter is not defined then the slice() method will extract up to end-1 which means it will use the length or size of the array for end parameter. We should also note that in the slice() method if the start parameter is not defined then slicing begins from the index 0 of the array and therefore this start parameter identifies the zero-based index of the array. This method returns a new array that contains the selected elements of the array. end: this parameter is used to define the index of an array at where the function should stop extracting the elements from the array.start: this argument is used to define the index of an array from where the function should start selecting the elements of an array.JSON.parse turns a string into an object.JSON.stringify turns an object into a string.We can make a deep copy of an Array using the combination of JSON.stringify and JSON.parse Let’s look at different ways to clone an array using deep copy: JSON.stringify() and JSON.parse() We can use deep copy instead to solve the problem arises with shallow copy of multi-dimensional (nested) array. Remember, deeper levels are referenced in shallow copy.
We see that both Array and its shallow copy have been changed because they share the reference.
They've both been changed because they share references Const fruits = Ĭonst veggies = Ĭonst grocery =
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