从 JavaScript 中的数组初始化变量

Question

I want to declare and assign default values to variables

let country, state, fruits;
let checkBoxfields = ['country', 'state', 'fruits'];
checkBoxfields.forEach(field=>{
    if(some condition){
        return field = true;
    }else{
        field = false;
    }

I want final output as such

country = true;
state = false;
fruits = true;

Answer 1

You can create an empty object and then iterate over the checkBoxFields and then populate the object as needed

const obj = {};

const checkBoxfields = ['country', 'state', 'fruits'];
checkBoxfields.forEach(field => {
    if (some condition) {
        obj[field] = true;
    } else {
        obj[field] = false;
    }
});

Sample output

console.log(obj); // {country: false, state: true, fruits: true}

Answer 2

If the structure is consistent and value are always in the same order, then you can map and destructure value in variable with desired name something like this

 let checkBoxfields = ['country', 'state', 'fruits']; let [country, state, fruits] = checkBoxfields.map(field => { return field === 'country' || field === 'fruits' }) console.log(country, state, fruits)

---

If the variables are defined in global scope you can use window to reference variable, That being said you should avoid using global as much as possible it has it's own drawback, makes code so hard to debug

 var country, state, fruits; const checkBoxfields = ['country', 'state', 'fruits']; checkBoxfields.forEach(field => { if (field === 'country' || field === 'fruits') { window[field] = true; } else { window[field] = false; } }); console.log(country,state,fruits)