Loops and Text

In the lesson on arrays, you saw that text isn't an array, but it has a .length, and you can read its characters by index: word[0] is the first character. That is all a loop needs, so you can go through text character by character, just like through an array:

const word = "Hello";
for (let i = 0; i < word.length; i++) {
    console.log(word[i]);
}

This prints:

H
e
l
l
o

The for...of loop works with text too. In each iteration, the variable holds the next character:

const word = "Hello";
for (const character of word) {
    console.log(character);
}

H
e
l
l
o

The patterns from the previous exercises work with text as well. This loop counts the letters l:

const word = "Hello";
let count = 0;
for (const character of word) {
    if (character === "l") {
        count++;
    }
}
console.log("Number of l:", count);

Number of l: 2

Remember that uppercase and lowercase letters are different characters: "H" === "h" is false.