Strings Example

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Common operations

let hello = "Hello"
console.log(hello.length)  // 5
console.log(hello.toLowerCase())  // hello
console.log(hello.toUpperCase())  // HELLO

Unicode

let namaste = "नमस्ते"
console.log(namaste)  // नमस्ते

Length of string

Caution: Not unicode-aware length.

let smiley = "😁"
console.log(smiley.length)  // 2

Unicode-aware length.

console.log([...smiley].length)  // 1

Loop over characters of string

Caution: Not unicode-aware length.

for (let i = 0; i < smiley.length; i++) {
    console.log(smiley.charAt(i))  // Malformed characters.
}

Unicode-safe way to loop over string.

const chars = [...smiley]
chars.forEach (function (char) {
    console.log(char)  // 😁
})

Substrings

Using number of characters

let helloWorld = "Hello World"
console.log(helloWorld.substr(6, 5))  // World

Allows overflow.

console.log(helloWorld.substr(6, 30))  // World

Between two indices.

console.log(helloWorld.substring(6, 11))  // World

Allows overflow.

console.log(helloWorld.substring(6, 30))  // World

TODO: Slice function

Includes/contains substring

console.log(hello.includes("llo"))  // true
console.log(hello.includes("wor"))  // false

Split

console.log(helloWorld.split(" "))  // [ 'Hello', 'World' ]