JS decreasing
I have a js question, just can't figure out 
, can someone help me understand the code, why can we decrease the object value right away?
Code here:
function checkItem(arr) {
let obj = { a: 1, b: 1, c: 1 };
for (let i = 0; i < arr.length; i++) {
let char = arr[i];
if (!obj[char]) {
return false;
} else {
// obj[char] - 1; //
How does it work?
}
}
return true;
}
let arr = ["a", "b", "c"];
console.log(checkItem(arr));
(PS: the function is for checking if the value in arr existing in an object with the right amount)
, can someone help me understand the code, why can we decrease the object value right away?Code here:
function checkItem(arr) {
let obj = { a: 1, b: 1, c: 1 };
for (let i = 0; i < arr.length; i++) {
let char = arr[i];
if (!obj[char]) {
return false;
} else {
// obj[char] - 1; //
How does it work?}
}
return true;
}
let arr = ["a", "b", "c"];
console.log(checkItem(arr));
(PS: the function is for checking if the value in arr existing in an object with the right amount)
