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Shifting string letters based on an array in JavaScript
Suppose we have a string that contains only lowercase english alphabets.For the purpose of this question, we define unit shifting of a letter as replacing that very letter to its succeeding letter in alphabets (including wrapping which means next to 'z' is 'a');
We are required to write a JavaScript function that takes in a string str as the first argument and an array of numbers arr of the same length that of str as the second argument. Our function should prepare a new string in which the letters of the original string are shifted by the corresponding units present in the array arr.
For example −
If the input string and the array are −
const str = 'dab'; const arr = [1, 4, 6];
Then the output should be −
const output = 'eeh';
Example
The code for this will be −
const str = 'dab';
const arr = [1, 4, 6];
const shiftString = (str = '', arr = []) => {
const legend = '-abcdefghijklmnopqrstuvwxyz';
let res = '';
for(let i = 0; i < arr.length; i++){
const el = str[i];
const shift = arr[i];
const index = legend.indexOf(el);
let newIndex = index + shift;
newIndex = newIndex <= 26 ? newIndex : newIndex % 26;
res += legend[newIndex];
};
return res;
};
console.log(shiftString(str, arr));Output
And the output in the console will be −
eeh
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