[FIXED] Typescript Error Argument Of Type String Is Not Assignable To Parameter Of Type Number

i had an object which contained a combination of numbers and strings, however, all properties in objects are strings. so i was looping an object and i only wanted to assign the properties that were numbers not string, i found thought i could just use isNaN so this is how my script looked like:

    let val = false;
    if(this.checkAll){
        val = true;
    }

    for(let checkQuestionId in this.factoryQuestionSearch) {

            if(!isNaN(checkQuestionId)) this.checkQuestionIds[checkQuestionId]=val;
        }

thats when i got this errro:

Typescript Error
Argument of type 'string' is not assignable to parameter of type 'number'.
../pages/search/search.ts

so to solve it, all i had to do is change the code to:

    let val = false;
    if(this.checkAll){
        val = true;
    }
        let temp:any;
        for(let checkQuestionId in this.factoryQuestionSearch) {
            temp = checkQuestionId.toString();
            Number(temp);
            if( !isNaN(temp)) this.checkQuestionIds[checkQuestionId]=val;
        }

as you can see, i added a temp variable and change the temp variable to a string with toString()

Ionic Framework: 3.2.1 Ionic App Scripts: 1.3.7 Angular Core: 4.1.0 Angular Compiler CLI: 4.1.0 Node: 7.7.3 OS Platform: Windows 10 Navigator Platform: Win32