Capitalize first letter of a string using Angular or typescript

 let str:string = 'hello';
 str = str[0].toUpperCase() + str.slice(1);

function titleCaseWord(word: string) {
  if (!word) return word;
  return word[0].toUpperCase() + word.substr(1).toLowerCase();
}

You can also use in template TitleCasePipe

Some component template:

{{value |titlecase}}

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