Question

How to find the first string in an array of strings that contains 0 duplicate characters with TypeScript

Answer 1

const isUniqueString = (str: string) => {
    return str.split('').every(el => str.indexOf(el) === str.lastIndexOf(el));
};

const findUniqueString = (arr: string[]) => {
    for (let i: number = 0; i < arr.length; i++) {
        if (isUniqueString(arr[i])) {
            return arr[i];
        };
    };
    
    return false;
};

const arr: string[] = ['typescript', 'java', 'rust', 'c', 'go', 'c++', 'python'];

console.log(findUniqueString(arr));

 
  
  
/*
run:
  
"rust" 
  
*/

 

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