length

Summary

An unsigned, 32-bit integer that specifies the number of elements in an array.

Description

The value of the length property is an integer with a positive sign and a value less than 2 to the 32 power (2³²).

You can set the length property to truncate an array at any time. When you extend an array by changing its length property, the number of actual elements does not increase; for example, if you set length to 3 when it is currently 2, the array still contains only 2 elements.

Examples

var numbers = [1,2,3,4,5];
for (var i = 0; i < numbers.length; i++) {
  numbers[i] *= 2;
}
// numbers is now [2,4,6,8,10];

if (statesUS.length > 50) {
   statesUS.length=50
}