JavaScript - Remove all falsy values from an array
Remove all falsy values from an array. Falsy values in JavaScript are false, null, 0, "", undefined, and NaN. Hint: Try converting each value to a Boolean.
Solution 1 boolean function
console = {
log: print,
warn: print,
error: print
};
function bouncer(arr) {
let newArr = []
for (let i = 0; i < arr.length; i++) {
if (Boolean(arr[i])) {
newArr.push(arr[i])
}
}
return newArr
}
console.log(bouncer([7, "ate", "", false, 9]));
Output:
7,ate,9
Solution 2 without boolean function
console = {
log: print,
warn: print,
error: print
};
function bouncer(arr) {
let newArray = [];
for (var i = 0; i < arr.length; i++) {
if (arr[i]) newArray.push(arr[i]);
}
return newArray;
}
console.log(bouncer([7, "ate", "", false, 9]));
Output:
7,ate,9
Solution 3 filter function
console = {
log: print,
warn: print,
error: print
};
function bouncer(arr) {
return arr.filter(Boolean);
}
console.log(bouncer([7, "ate", "", false, 9]));
Output:
7,ate,9