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- const isOnlyLettersAndDigits = str => {
- for (let i = 0; i < str.length; i++) {
- let n = str.charCodeAt(i)
- if (!(n >= 97 && n <= 122) && !(n >= 65 && n <= 90) && !(n >= 48 && n <= 57))
- return false
- }
- return true
- }
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