how to compare array to see if it contains specific values [duplicate]

Question

i have an array of values that i want to check for to see if it contains 3 specific values and if it does not, i would like to check which ones that the array does not contain.

3 values:

'docx', 'pdf', 'jpg'

array:

var comps = [
    { file: 'docx' },
    { file: 'pdf' },
    { file: 'txt' },
    { file: 'png' },
    { file: 'pdf' }
]

function:

function checkCodes () {
    angular.forEach( comps, function (comp) {
        if(comp.file === 'docx' && comp.file === 'pdf' && comp.file === 'jpg') {
            return true;
        } else {
            return false;
        }
    })
}

currently i think its looping over one at a time so it always returns false based on that only 1 value is being checked at a time.

comp.file can't possibly be equal to 'docx' and to 'pdf'. It could be one, or the other, or something else. — JB Nizet
– JB Nizet, Commented Apr 4, 2019 at 21:18
Your return false is inside forEach block. The very first time you find an element that does not match your condition it fires and you get your false result. — PM 77-1
– PM 77-1, Commented Apr 4, 2019 at 21:20

Khaled Sameer · Accepted Answer · 2019-04-04 21:26:26Z

1

this is easier

hasAnyDoc = comps.findIndex( f => f.file === 'docx' || f.file === 'pdf' || f.file === 'jpg' ) > -1

answered Apr 4, 2019 at 21:26

Khaled Sameer

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