What is the difference between slice() and substr() in JavaScript?

Question

Can I ask what the difference is between string object slice() and substr() in JavaScript?

Answer 1

Substring()

1.If start equals stop, it returns an empty string. 2.If stop is omitted, it extracts characters to the end of the string. 3.If start > stop, then substring will swap those 2 arguments. 4.If either argument is greater than the string's length, either argument will use the string's length. 5.If either argument is less than 0 or is NaN, it is treated as if it were 0.

slice()

1.If start equals stop, it returns an empty string, exactly like substring(). 2.If stop is omitted, slice extracts chars to the end of the string, exactly like substring(). 3.If start > stop, slice() will NOT swap the 2 arguments. 4.If either argument is greater than the string's length, either argument will use the string's length, exactly like substring().