| Tags | tdd regular-expressions |
| Hard Prerequisites | |
| IMPORTANT: Please review these prerequisites, they include important information that will help you with this content. | |
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This a continuation of PROJECT: string-calculator part 1 . All the functionality developed there should still work here.
Please note that this project should be done in a TDD manner.
add("//;\n1000;1;2")
// should return 3
As long as the string passed into the add function follows this format, “//[delim1][delim2]\n[integers…]”, the add function should be able to handle it:
For example:
add("//[:D][%]\n1:D2%3")
// should return 6
add("//[***][%%%]\n1***2%%%3")
// should return 6
add("//[(-_-')][%]\n1(-_-')2%3")
// should return 6
add("//[abc][777][:(]\n1abc27773:(1")
// should return 7
If the string passed in is invalid, your code should be able to detect this and throw an error.
Hint: A valid string input follows these formats:
- "integer,integer,integer" e.g "1,2" or "1,2,3,4"
- "integer \n integer,integer e.g "1\n2,3"
- "//delimiter \n integer delimiter integer" e.g "//;\n1;2"
- "//[delimiter][delimiter]\n integer delimiter integer" e.g "//[\*][%]\n1\*2%3"
If the string does not abide by any of these formats, it should be considered invalid. Square brackets ([ or ]) are used as identifiers, and will not be used as delimiters. Any string with these as delimiters should also be considered invalid.
add("//;\n1000;1;2;")
// should throw the following:
'ERROR: invalid input'
add(" //;\n1000,1;2")
// should throw the following:
'ERROR: invalid input'
add("1,2,3//;\n1000,1;2")
// should throw the following:
'ERROR: invalid input'
add("//]\n90]11]20")
// should throw the following:
'ERROR: invalid input'
add("//[[][[][&&]\n1[2[3&&4")
// should throw the following:
'ERROR: invalid input'
print, an exception is to be thrown when needed and a value returned when needed.