How to use JavaScript Array.prototype.slice() - JavaScript Slice Explained with Examples

Guide
1

The JavaScript array method .slice() will return a new array object which will be a segment (a slice) of the original array. The original array is not modified.

Syntax

  array.slice()
  arr.slice(startIndex)
  arr.slice(startIndex, endIndex)

Parameters

  • startIndex The zero-based index where the slice should begin. If the value is omitted, it will start at 0.
  • endIndex The slice will end before this zero-based index. A negative index is used to offset from the end of the array. If the value is omitted, the segment will slice to the end of the array.

Examples

  var array = ['books', 'games', 'cup', 'sandwich', 'bag', 'phone', 'cactus']
  
  var everything = array.slice()
  // everything = ['books', 'games', 'cup', 'sandwich', 'bag', 'phone', 'cactus']
  
  var kitchen = array.slice(2, 4)
  // kitchen = ['cup', 'sandwich']
  
  var random = array.slice(4)
  // random = ['bag', 'phone', 'cactus']
  
  var noPlants = array.slice(0, -1)
  // noPlats = ['books', 'games', 'cup', 'sandwich', 'bag', 'phone']
  
  // array will still equal ['books', 'games', 'cup', 'sandwich', 'bag', 'phone', 'cactus']
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