JavaScript Array slice() Method

February 8, 2021 10:45 am IST

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JavaScript Array slice() Method

The slice() method returns the selected elements (from start index to end index) in an array, as a new array object.

Note: This method does not alter the original array.

Default start index and end index

In the following example, we will omit both start index and end index, so that the JavaScript will assign the default value to both.

Example

HTML Online Editor

<!DOCTYPE html> <html> <body> <p>Start from array index 3 to the length of an array.</p> <script> var myNumber = [1, 2, 3, 4, 5, 6, 7]; var newArray = myNumber.slice(); document.write("newArray = " +newArray); document.write("<br> myNumber = " +myNumber); </script> </body> </html>

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Syntax

Array.slice(start, end)

Parameter Values

Value	Type	Explanation
start	Optional	Specifies the starting index of an array to be selected. A negative index can be used to select the array elements in reverse order i.e., from right to left. If omitted, the default value is '0'.
end	Optional	Specifies the ending index of an array to be selected. A negative index can be used to select the array elements in reverse order i.e., from right to left. If omitted, the default value is the 'length of an array'.

Specific start index and Default end index

In the following example, we will specify the value for the start index and the browser will assign the default value for the end index.

Example

HTML Online Editor

<!DOCTYPE html> <html> <body> <p>From array index 3 to the length of an array</p> <script> var myNumber = [1, 2, 3, 4, 5, 6, 7]; var newArray = myNumber.slice(3); document.write("newArray = " +newArray); document.write("<br> myNumber = " +myNumber); </script> </body> </html>

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Specific start index and end index

In the following example, we will specify the value for both the start index and end index.

Example

HTML Online Editor

<!DOCTYPE html> <html> <body> <p>Start from array index 1 and end right before array index 3.</p> <script> var myNumber = [1, 2, 3, 4, 5, 6, 7]; var newArray = myNumber.slice(1, 3); document.write("newArray = " +newArray); document.write("<br> myNumber = " +myNumber); </script> </body> </html>

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