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javascriptconditional-operator

JS call a different method on array depending on boolean

I have array var A = ['aa', 'bb', 'cc'];. If Boolean callFilter is true, I want to call .filter(x => x ==='bb') on it, if its false I want to call .concat('dd'). Is there a way other than

var result;
if(callFilter){
    result = A.filter(x=> x === 'bb');
} else {
    result = A.concat('dd');
}
console.log(result) // ['bb']

Id like to use ternary operation, but dont know if its possible to use it in form of

result = A[(callFilter) ? .filter(x => x === 'bb') : .concat('dd)]; // this doesnt work.
Solution

  • That is not possible. You can access a property conditionally, though that would require writing the condition twice in this case:

    let result = A[callFilter ? 'filter' : 'concat'](callFilter ? x => x === 'bb' : 'dd');

    It is better to just move the condition and repeat the variable A twice.

    let result = callFilter ? A.filter(x => x === 'bb') : A.concat('dd');