What is the difference between
Quick tip for remembering the difference:
substr() accept an index-based first parameter, but the second parameter of
substring() is index-based (the end index), while the second parameter of
substr() length-based (number of characters to return).
Under most conditions, both behave very similarly. Take a look at these examples.
const name = 'hippopotamus';
The difference becomes obvious when both the parameters are specified and the starting index is a positive integer, and the end index is within the length of the string.
substr() is considered "legacy", so you might as well forget about its existence . Always prefer to use
substring() returns the characters of a string from a starting index to an end index,
substr() on the other hand, returns an
n number of characters from a starting index.