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Validating alternating vowels and consonants in JavaScript
Problem
We are required to write a JavaScript function that takes in a string of English alphabets, str, as the first and the only argument. Our function should return true if and only if the vowels and consonants appear alternatingly in the input string, false otherwise.
For example, if the input to the function is −
Input
const str = 'amazon';
Output
const output = true;
Output Explanation
Because the vowels and consonants appear alternatingly in the string ‘amazon’.
Example
Following is the code −
const str = 'amazon';
const appearAlternatingly = (str = '') => {
return str.split('').every((v,i)=>{
if (/[aeiou]/.test(str[0])){
if (i%2===0&&/[aeiou]/.test(v)){
return true
} else if (i%2!==0&&!/[aeiou]/.test(v)){
return true
} else {
return false
}
}
if (!/[aeiou]/.test(str[0])){
if (i%2==0&&!/[aeiou]/.test(v)){
return true
} else if (i%2!==0&&/[aeiou]/.test(v)){
return true
} else {
return false
}
}
})
};
console.log(appearAlternatingly(str));Output
true
Updated on: 22-Apr-2021
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