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07-string-reverse-solition.js #18

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07-string-reverse-solition.js #18

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07-string-reverse-solition.js
lacyjpr Oct 20, 2019
d0d747b
Clean up
lacyjpr Oct 21, 2019
ef9d106
Tighten commentary
lacyjpr Oct 21, 2019
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14 changes: 13 additions & 1 deletion javascript/solutions/07-string-reverse-solition.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,16 @@
// .reverse() is an Array built in method, String does not have it.
// to use it, we have to turn our string in an array, reverse and then join it again.

const revertString = (str) => str.split("").reverse().join("");
const revertString = (str) => str.split("").reverse().join("");

// Alternative less elegant solution: Take the input string, iterate backwards through the string & build the reversed string with concat.

const reverseString = str => {

let reversed = "";
let i = str.length - 1; // Remove from the for loop for efficiency.

for (i; i > -1; i--) {
reversed += str[i]; // concat chars to the reversed string. str[i] starts at the last character, so the output is a reversed string.
}
};