I have a string and I need to check with and get whether following strings are overlapped at my tagart string with its end or start.
Target string: "click on the Run"
search strings: "the Run button to" ,"code and click on"
Apparently:
"the Run button to" is overlapped at the end of target "click on the Run"
"code and click on" is overlapped at the start of target "click on the Run"
So "the Run" and "click on" will be the results I need
I have come up with a function to check and get the overlapped results for the cases at the start and at the end separately
Question:
But my code could not be able to get the expected results only if I know the how the search string overlap with target string in the very first place. And how can I combine the searched results in one go as well?
function findOverlapAtEnd(a, b) {
if (b.length === 2) {
return "";
}
if (a.indexOf(b) >= 0) {
return b;
}
if (a.endsWith(b)) {
return b;
}
return findOverlapAtEnd(a, b.substring(0, b.length - 1));
}
function findOverlapAtStart(a, b) {
if (b.length === 2) {
return "";
}
if (a.indexOf(b) >= 0) {
return b;
}
if (a.startsWith(b)) {
return b;
}
return findOverlapAtStart(a, b.substring(1));
}
console.log(findOverlapAtEnd("click on the Run", "the Run button to"))
console.log(findOverlapAtStart("click on the Run", "code and click on"))Because I need to decompress and I find these logic puzzles fun, here's my solution to the problem...
https://highdex.net/begin_end_overlap.htm
You can view source of the page to see JavaScript code I used. But just in case I ever take that page down, here's the important function...
function GetOverlappingSection(str1, str2, minOverlapLen = 4) {
var work1 = str1;
var work2 = str2;
var w1Len = work1.length;
var w2Len = work2.length;
var resultStr = "";
var foundResult = false;
var workIndex;
if (minOverlapLen < 1) { minOverlapLen = 1; }
else if (minOverlapLen > (w1Len > w2Len ? w2Len : w1Len)) { minOverlapLen = (w1Len > w2Len ? w2Len : w1Len); }
//debugger;
//we have four loops to go through. We trim each string down from each end and see if it matches either end of the other string.
for (var i1f = 0; i1f < w1Len; i1f++) {
workIndex = work2.indexOf(work1);
if (workIndex == 0 || (workIndex != -1 && workIndex == w2Len - work1.length)) {
//we found a match!
foundResult = true;
resultStr = work1;
break;
}
work1 = work1.substr(1);
if (work1.length < minOverlapLen) { break; }
}
if (!foundResult) {
//debugger;
//reset the work vars...
work1 = str1;
for (var i1b = 0; i1b < w1Len; i1b++) {
workIndex = work2.indexOf(work1);
if (workIndex == 0 || (workIndex != -1 && workIndex == w2Len - work1.length)) {
//we found a match!
foundResult = true;
resultStr = work1;
break;
}
work1 = work1.substr(0, work1.length - 1);
if (work1.length < minOverlapLen) { break; }
}
}
if (!foundResult) {
//debugger;
//reset the work vars...
work1 = str1;
for (var i2f = 0; i2f < w2Len; i2f++) {
workIndex = work1.indexOf(work2);
if (workIndex == 0 || (workIndex != -1 && workIndex == w1Len - work2.length)) {
//we found a match!
foundResult = true;
resultStr = work2;
break;
}
work2 = work2.substr(1);
if (work2.length < minOverlapLen) { break; }
}
}
if (!foundResult) {
//debugger;
//reset the work vars...
work2 = str2;
for (var i2b = 0; i2b < w2Len; i2b++) {
workIndex = work1.indexOf(work2);
if (workIndex == 0 || (workIndex != -1 && workIndex == w1Len - work2.length)) {
//we found a match!
foundResult = true;
resultStr = work2;
break;
}
work2 = work2.substr(0, work2.length - 1);
if (work2.length < minOverlapLen) { break; }
}
}
return resultStr;
}
Hopefully that's helpful.