The code from the Learn JavaScript the Hard Way module JavaScript Level 1 exercises. This is a mirror of the code I have in the book, so if you're struggling you can use this to compare against your attempts.
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let pigments = ["perinone", "cadmium",
"titanium", "ultramarine", "napthol"];
let i = 0;
// you've seen this already
while(i < pigments.length) {
console.log(`while ${i}=${pigments[i]}`);
i++;
}
// you can do the above in one move like this
for(let i = 0; i < pigments.length; i++) {
console.log(`for ${i}=${pigments[i]}`);
}
// but this is the easiest of all
for(let paint of pigments) {
console.log(`for-of ${paint}`);
}