const removeFalsyValues = (arr) => {
let truthy = []
for(let i = 0; i < arr.length; i++){
if(arr[i]) {
truthy.push(arr[i])
}
}
return truthy;
}
console.log('removeFalsyValues:', removeFalsyValues([0, 1, false, 2, "", 3, undefined, NaN, null]))
Falsy values in JavaScript are values that are considered false when evaluated in a Boolean context. These include0, false, "" (an empty string), undefined, NaN, and null.
Here's how the function works:
- Initialize an empty array: The function starts by creating an empty array called truthy. This will be used to store the values from the original array that are not falsy.
- Loop through the array: The function uses a for loop to go through each element in the input array arr.
- Check if the element is truthy: Inside the loop, there's an if statement that checks if the current element (arr[i]) is truthy. If the element is truthy (meaning it's not one of the falsy values), it gets added to the truthy array.
- Return the truthy array: After the loop has gone through all the elements, the function returns the truthy array, which now contains only the truthy values.
- The input array is
[0, 1, false, 2, "", 3, undefined, NaN, null]. - The function will loop through each element and remove the falsy ones
(0, false, "", undefined, NaN, null). - The remaining truthy values
(1, 2, 3)are returned in a new array:[1, 2, 3].
So, the output of this code will be:removeFalsyValue [1, 2, 3].
Top comments (12)
that's cool, I just wanted to use vanilla js to explain how to write with core vanilla.js :)
I used core vanilla JS
yeah I mean without using in-built function.
i wanted explain people how it actually works behind the scene like the iteration part and all.
Array.pushis a built-in function 🙂bro doens't my code explain in more details, like how its works and different approach :D
For the pedant in me, the function provided does not filter out falsy values from an array, instead it returns a new array that includes only the non-falsy values from the source array. The original array is unmodified.
A function which actually filters out the falsy values from an array would be:
cool thanks for the answer, everyone has different approach. :P
It seems like output of ChatGPT.
And can do it way simpler
On the left, click 3 dots, and "Report abuse".
Why bro, why do you think it's chatgpt output, i tried with core vanilla.js, because i wanted to. everyone has different approaches :)
"The return false value may indicate that I haven't run any tests."
Const check=(gettting)=>{
First.filter((ele)=>{
Ele===false })
}
Let first=[1,2,3,4,0,false ]
check(first)