string function in javascript code example

Example 1: js string

String(thing)

Example 2: js string

`hello world`
`hello!
 world!`
`hello ${who}`
escape `<a>${who}</a>`

Example 3: js strings

// Making Strings
let color = "purple";

// Single quotes work too:
let city = 'Tokyo';

//Strings have a length:
city.length; //5

//We can access specific characters using their index:
city[0]; //'T'
city[3]; //'y'

// String methods:
'hello'.toUpperCase(); // "HELLO";
'LOL'.toLowerCase(); // "lol"
'    omg  '.trim(); // "omg"

// String methods with arguments:
// ==============================

//indexOf returns the index where the character is found (or -1 if not found)
'spider'.indexOf('i'); //2
'vesuvius'.indexOf('u'); //3 - only returns FIRST matching index
'cactus'.indexOf('z'); //-1 not found

// slice - returns a "slice" of a string
"pancake".slice(3); //"cake" - slice from index 3 onwards
"pancake".slice(0, 3); //"pan" - slice from index 0 up to index 3

// replace - returns a new string, with the FIRST match replaced
"pump".replace("p", "b"); //"bump" - only replaces first "p"

// String Template Literals
// Use backtick characters, NOT SINGLE QUOTES!
// ========================
const color = "olive green";
const msg = `My favorite color is: ${color}` //"My favorite color is: olive green"

const str = `There are ${60 * 60 * 24} seconds in a day`//"There are 86400 seconds in a day"

Example 4: javascript function from string

var addition = Function("a", "b", "return a + b;");
alert(addition(5, 3)); // shows '8'

Example 5: JavaScript Strings

var x = "SAMER";