function capitalizeFirstLetter(str: string): string {

  return str.charAt(0).toUpperCase() + str.slice(1);

}

​

const input = 'hello world';

const output = capitalizeFirstLetter(input);

console.log(output); // Prints "Hello world"

text.replace(/(^\w|\s\w)/g, m => m.toUpperCase());

// Explanation:

// 

// ^\w : first character of the string

// | : or

// \s\w : first character after whitespace

// (^\w|\s\w) Capture the pattern.

// g Flag: Match all occurrences.

​

// Example usage:

​

// Create a reusable function:

const toTitleCase = str => str.replace(/(^\w|\s\w)/g, m => m.toUpperCase());

​

// Call the function:

const myStringInTitleCase = toTitleCase(myString);

​

​

const lower = 'this is an entirely lowercase string';

const upper = lower.charAt(0).toUpperCase() + lower.substring(1);

//Altered, "capitalize all words of a string" (javascript by Grepper on Jul 22 2019) answer to compatible with TypeScript

​

var myString = 'abcd abcd';

​

capitalizeWords(text){

  return text.replace(/(?:^|\s)\S/g,(res)=>{ return res.toUpperCase();})

};

​

console.log(capitalizeWords(myString));

​

//result = "Abcd Abcd" 

​

​

function capitalizeFirstLetter(string) {

     return string.charAt(0).toUpperCase() + string.slice(1);

}

​

​

function capitalizeFirstLetter(string) {

    return string.charAt(0).toUpperCase() + string.slice(1);

}

​

// this will only capitalize the first word

var name = prompt("What is your name");

firstLetterUpper = name.slice(0,1).toUpperCase();

​

alert("Hello " + firstLetterUpper + name.slice(1, name.length).toLowerCase());

​

function capitalizeFirstLetter(string) {

  return string.charAt(0).toUpperCase() + string.slice(1);

}

​

console.log(capitalizeFirstLetter('foo')); // Foo

 Run code snippet

function capitalize(word) {

    return word.charAt(0).toUpperCase() + word.toLocaleLowerCase().substring(1)

}

capitalize("bob");

const names = ["alice", "bob", "charlie", "danielle"]

// -->        ["Alice", "Bob", "Charlie", "Danielle"]

​

//Just use some anonymous function and iterate through each of the elements in the array

//and take string as another array

let namescap = names.map((x)=>{

    return x[0].toUpperCase()+x.slice(1)

})

console.log(namescap)