for (let index = 1; index <= 3; index += 1) {
console.log(index);
}index starts at 1 and is printed through 3 inclusive.
LESSON 24 OF 50
Count with for
Group initialization, condition and update in one loop.
STEP 1 · LEARN
How it works
The classic for form has three parts: initialization runs once, the condition is checked before each iteration, and the update runs after the body.
for (let index = 1; index < 3; index += 1) { console.log(index); }The < operator stops the loop before index reaches 3.
STEP 2 · APPLY
Your exercise
Use for to print 1, 2 and 3 through the index variable.
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STEP 4 · CHECK
What needs to pass
0%not checked
- ○for declares index from 1, checks <= 3, updates and prints it.
- ○The output is 1, 2, 3.
- ○The loop finishes without an error.
Explain the solution logic
The three header parts control the loop start, limit and step.