What's the reason for Vue alerting me about an endless loop?

Upon using Vue, I encountered a warning message:

You may have an infinite update loop in a component render function

Although I attempted to resolve the issue by switching from methods to computed properties, the warning persisted. Everything seems to be functioning correctly without any loops, but Vue continues to display the warning.

.battle__invite(v-for='(invite, index) in invites', :key='index')
  battle__result.battle__result--finished(         
      :class='getResultClass(invite.challengerScore, invite.challengedScore)'
    ) {{ challengeResult }}

Computed:

getResultClass() {
      return (challengerScore, challengedScore) => {
        if (challengerScore > challengedScore) {
          this.challengeResult = 'win'
          return 'win'
        } else if (challengerScore < challengedScore) {
          this.challengeResult = 'defeat'
          return 'defeat'
        } else {
          this.challengeResult = 'draw'
          return 'draw'
        }
      }
    },

Answer №1

The issue arises from the challengeResult variable being used in both the template and computed property, leading to an infinite re-rendering loop.

If you insert a

console.log("im in computed property")
statement inside the getResultClass function, you will observe approximately 200 instances of the console log, highlighting the re-rendering bug. Thankfully, Vue prevents infinite re-rendering and resolves the issue efficiently.

Here's why this occurs: within the template, getResultClass is called, which subsequently modifies the challengeResult variable in the computed property. As a result, since challengeResult is also utilized in the template section, triggering another re-render, causing the computed property to execute once more. This cycle continues indefinitely!

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