Angular Tutorial: Retrieve values in array that are over 100

I'm having trouble showing the length of items in my array that exceed 100 by using a function call. I keep encountering this error message "ERROR TypeError: Cannot read property 'filter' of undefined". Can someone please assist me?

html

<div><p> {{getIssuesCount()}} </p></div>

ts

 getIssuesCount() {
    const issuesCount = this.wells.filter(wells => wells.totalCost > 100)
    return issuesCount.length
  }

Answer №1

This indicates that the variable wells is not defined. To fix this issue, you can either use

this.wells?.filter(wells => wells.totalCost > 100)
or declare it earlier in your code (this.wells = [])

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