freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/debugging/prevent-infinite-loops-with-a-valid-terminal-condition/index.md

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Prevent Infinite Loops with a Valid Terminal Condition

Prevent Infinite Loops with a Valid Terminal Condition

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Problem Explanation

• To prevent an infinite loop, the while-condition must reach a terminal condition to exit out of the loop.
• So the error in this challenge occurs due to the condition - i != 4 - in the for loop.
• If you take a closer look at the code:

function myFunc() {
  for (let i = 1; i != 4; i += 2) {
    console.log("Still going!");
  }
}

• You will see that i is first initialised as 1 and after every iteration of the loop, i is incremented by 2.
• Using this logic, after the first iteration - i = 3 and the second iteration i = 5, the condition i != 4 will never be met and an infinite loop will occur.

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Solutions

Solution 1 (Click to Show/Hide)

function myFunc() {
  for (let i = 1; i <= 4; i += 2) {
    console.log("Still going!");
  }
}