How to check if array of string enums contains a string

Question

I have declared an enum in typescript as follows:

enum MultiPhaseUnits {
    AMPERAGE = 'AMPERAGE',
    VOLTAGE = 'VOLTAGE',
    POWER_FACTOR = 'POWER_FACTOR',
    LINE_VOLTAGE = 'LINE_VOLTAGE'
}

and created an array of enum values as such:

this.multiPhaseUnits = [MultiPhaseUnits.AMPERAGE, MultiPhaseUnits.LINE_VOLTAGE, MultiPhaseUnits.POWER_FACTOR, MultiPhaseUnits.VOLTAGE];

My problem is that when I go to check if a string is included in this array, VScode says parameter of type string is not assignable to parameter of type MultiPhaseUnit. For example:

if (this.multiPhaseUnits.indexOf(queryable.unit.apiUnit) > -1) {...}

It puts a red squiggly under queryable.unit.apiUnit, where apiUnit is a string in the form AMPERAGE, LINE_VOLTAGE.... I have verified this code will work and verified that the array multiPhaseUnits[] will end up essentially being an array of strings. Why is VScode complaining about this check? Even though my code works, if I am doing something wrong, how can I fix it?

Aviv Biton · Accepted Answer · 2019-03-19 20:47:56Z

1

You need to convert the string to type of MultiPhaseUnits.

if (this.multiPhaseUnits.indexOf(MultiPhaseUnits[queryable.unit.apiUnit]) > -1)

answered Mar 19, 2019 at 20:47

Aviv Biton

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1 Comment

Nikhil Badami Over a year ago

That was it! Thanks!

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