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oneAway. simple and efficient #92

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72 changes: 13 additions & 59 deletions chapter01/1.5 - OneAway/oneAway.js
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Original file line number Diff line number Diff line change
@@ -1,64 +1,18 @@
var oneAway = function(string1, string2) {
// insert a char for str1 -> remove a char for str2
var checkOneMissing = function(first, second) {
if (first.length !== second.length - 1) {
return false;
} else {
var mulligan = false;
var fP = 0; // first Pointer
var sP = 0; // second Pointer
while (fP < first.length) {
if (first[fP] !== second[sP]) {
if (mulligan) {
return false;
} else {
mulligan = true;
sP++; // second length is longer
}
} else {
fP++;
sP++;
function oneAway(str1,str2){
str1 = str1.split("");
str2 = str2.split("");
let changes = 0;
for(let i = 0; i< str1.length; i++){
const charIndex = str2.indexOf(str1[i]);
if(charIndex == -1){
changes +=1;
}else{
str2.splice(charIndex,1)
}
}
return true;
}
};

var checkOneDiff = function(first, second) {
if (first.length !== second.length) {
return false;
} else {
var mulligan = false;
var fP = 0; // first Pointer
var sP = 0; // second Pointer
while (fP < first.length) {
if (first[fP] !== second[sP]) {
if (mulligan) {
return false; // more than one mismatch
} else {
mulligan = true; // use up mulligan
}
}
fP++;
sP++;
}
return true;
}
};
// insert a char for str1 -> remove a char for str2
// check one diff

// console log checks
// console.log(string1, string2, 'checkMiss', checkOneMissing(string1, string2));
// console.log(string2, string1, 'checkMiss', checkOneMissing(string2, string1));
// console.log(string1, string2, 'checkDiff', checkOneDiff(string1, string2));

return checkOneMissing(string1, string2) || checkOneMissing(string2, string1) || checkOneDiff(string1, string2);
};


// Test
return changes <= 1;
}
console.log(oneAway('pale', 'ple'), true);
console.log(oneAway('pales', 'pale'), true);
console.log(oneAway('pale', 'bale'), true);
console.log(oneAway('pale', 'bake'), false);
console.log(oneAway('pale', 'bake'), false);