cannot get length of array passed as a function parameter

Question

I would get a length of an array that I pass in the parameter of a function

I have an array of object

groupList:group[]=[];

in selectItem I call testExistinginArray function

selectItem (event) {
    if(!this.toggle) {
        this.groupList.push(event);
    }
    else{
        this.ejList.push(event);
        if(!this.testExistinginArray(event,this.groupList)) { //I pass groupList as parameter
            this.groupList.push({code:event.codeBusinessGroup,name:event.nameBusinessGroup})
        }
    }
}

testExistinginArray(event,type: any[]) {
    for(let i=0;i<this.type.length;i++) {
        if (this.type[i].code.indexOf(event.codeBusinessGroup)===-1) {
            return false
        }
        else{
            return true
        }
    }
}

Actually I get undefined length error

TypeError: Cannot read property 'length' of undefined

in html input ` (onSelect)="selectItem($event)"` of this component ` — infodev
– infodev, Commented Mar 21, 2018 at 11:23
Use type.length instead of this.type.length. Here type is not function variable, it's argument variable. So you can't read using this — Ankur
– Ankur, Commented Mar 21, 2018 at 11:23
yes I have forgotten to delete this after changing var. you can put it as an answer I'll accept it — infodev
– infodev, Commented Mar 21, 2018 at 11:27

Ankur · Accepted Answer · 2018-03-21 11:29:10Z

1

Use type.length instead of this.type.length. Here type is not function variable, it's argument variable. So you can't read using this

answered Mar 21, 2018 at 11:29

Ankur

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Vasyl Moskalov · Accepted Answer · 2018-03-21 11:23:35Z

0

You tried to extract attribute length from this.type, not from function parameter type. Looks like typo

answered Mar 21, 2018 at 11:23

Vasyl Moskalov

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