📖 Deeper dive reading: MDN String
Strings are a primitive type in JavaScript. A string variable is specified by surrounding a sequence of characters with single quotes ('), double quotes ("), or backticks (`). The meaning of single or double quotes are equivalent, but the backtick defines a string literal that may contain JavaScript that is evaluated in place and concatenated into the string. A string literal replacement specifier is declared with a dollar sign followed by a curly brace pair. Anything inside the curly braces is evaluated as JavaScript. You can also use backticks to create multiline strings without having to explicitly escape the newline characters using \n.
'quoted text'; // " also works
const l = 'literal';
console.log(`string ${l + (1 + 1)} text`);
// OUTPUT: string literal2 textJavaScript supports Unicode by defining a string as a sequence of 16-bit unsigned integers that represent UTF-16-encoded characters. Unicode support allows JavaScript to represent most languages spoken on the planet. This includes those that are read from right to left.
حجر
أقول لهذا الحجر: أنا أنت. فيقول: لستَ مرناً الى هذا الحدّ. أقول: قلبي مثلك؟ فيقول:
However, there are several important steps you must take in order to make your web application fully internationalized. This includes handling of currency, time, dates, iconography, units of measure, keyboard layouts, and respecting local customs. Read this article on the W3C website to learn more about internationalization.
The string object has several interesting functions associated with it. Here are some of the commonly used ones.
| Function | Meaning |
|---|---|
| length | The number of characters in the string |
| indexOf() | The starting index of a given substring |
| split() | Split the string into an array on the given delimiter string |
| startsWith() | True if the string has a given prefix |
| endsWith() | True if the string has a given suffix |
| toLowerCase() | Converts all characters to lowercase |
const s = 'Example:조선글';
console.log(s.length);
// OUTPUT: 11
console.log(s.indexOf('조선글'));
// OUTPUT: 8
console.log(s.split(':'));
// OUTPUT: ['Example', '조선글']
console.log(s.startsWith('Ex'));
// OUTPUT: true
console.log(s.endsWith('조선글'));
// OUTPUT: true
console.log(s.toLowerCase());
// OUTPUT: example:조선글