I learn js and trying to write filter method without using it. So I need to my function return filtered array based on function, which passed as a parameter. And it does but it's returned boolean array and I don't understand why.
My code:
function myFilter(arr, func) {
const result = [];
for (let el of arr) {
result.push(func(el));
}
return result;
}
Calling with some numbers:
myFilter([2, 5, 1, 3, 8, 6], function(el) { return el > 3 })
It should've returned [5, 8, 6] but instead I got [false, true, false, true, true]. I don't get why can someone please explain it to me?
It's returning a boolean array because you're pushing booleans into the result array. func(el) or function(el) { return el > 3 } returns a boolean.
What you want is to push elements/numbers into the result array based on the condition of func(el)
Try
function myFilter(arr, func) {
const result = [];
for (let el of arr) {
if (func(el)) {
result.push(el);
}
}
return result;
}
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