how to check if all alphabet letters is used in javascript code example

Example 1: how to check if a string has only alphabets in javascript

if (!/[^a-zA-Z]/.test(word))

Example 2: checking if a character is an alphabet in js

function isLetter(str) {
  return str.length === 1 && str.match(/[a-z]/i);
}

Example 3: check if something is a letter in js

string.charAt(1).toUpperCase() !== string.charAt(1).toLowerCase()

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Javascript Example

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