![]() ![]() For instance, index -2 in an array with the length of 5, the index would be at index (5–2 = 3). ![]() When thinking about negative index ( -n ), use the formula of sequence.length - n. if you want to use this copy you make, make sure assign this copied array/string to a variable.Įxample (array): // array const dunderMifflin = const employees = dunderMifflin.slice() console.log(employees) // Įxample (string): // string const michael = "People say I'm the best boss." const boss = michael.slice() console.log(boss) // People say I'm the best boss. But do remember slice does not mutate the sequence, i.e. If you simply want to make a copy, array.slice() would suffice. If the end index is greater than the length of sequence, slice would go all the way to the end of the sequence regardless. Relevant Links Array.slice () Array. That is, we cannot make any changes to the original arrays. We’ve also got to ensure that the original arrays are not mutated. But when we include the end index, the slicing would stop up to whatever index you indicate but not included.įor instance, using our string example, michael.slice(11,29) means we would start slicing from 11th index ‘I’ to 28th index ‘.’ (just a reminder, the length of the string is 29, therefore this would slice up to the index (29–1 = 28)). Slice and Splice Problem Explanation We need to copy each element from the first array into the second array starting at the index n. ⚡️ end(optional): if we don’t include the end index, the array/string would slice all the way to the end. In our array example above, dunderMifflin.slice(1) means we would start “slicing” the array from index 1, aka (as we know the first index in a string/array is 0). ⚡️ start: the first index (or zero-based index, according to MDN) you want to start slicing the array/index. Syntax for both array and string: // array array.slice(start) // string str.slice(start) ![]()
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