JavaScript output based interview questions

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1. What will be the output

let arr = [1, 2, 3, 4, 5, -6, 7];
arr.length = 0;
console.log(arr);

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2. What will be the output

x = 10;
console.log(x);
var x;

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3. What will be the output

let a = { x: 1, y: 2 }
let b = a;
b.x = 3;
console.log(a);
console.log(b);

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4. What will be the output

for(var i = 0; i < 10; i++){
    setTimeout(function(){
      console.log("value is " + i);
  })
}

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5. What will be the output

for(let i = 0; i < 10; i++){
    setTimeout(function(){
      console.log("value is " + i);
  })
}

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6. What will be the output

function hello() {
  console.log("1");
    setTimeout(() => {
        console.log("2");
    })
  console.log("3");
}
hello();

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7. What will be the output

let f = "8";
let a = 1;
console.log((+f)+a+1);

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8. What will be the output

let a = 10;
if(true){
   let a = 20;
   console.log(a, "inside");
}
console.log(a, "outside");

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9. What will be the output

var a = "xyz";
var a = "pqr";
console.log(a)

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10. What will be the output

const arr1 = [1, 2, 3, 4];
const arr2 = [6, 7, 5];
const result = [...arr1, ...arr2];
console.log(result);

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11. What will be the output

const person1 = { name: 'xyz', age: 21 };
const person2 = { city: 'abc', ...person1 };
console.log(person2);

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12. What will be the output

console.log(5 < 6 < 7);

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13. What will be the output

console.log(7 > 6 > 5);

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14. What will be the output

console.log(0 == false);
console.log(1 == true);

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15. What will be the output

console.log([11, 2, 31] + [4, 5, 6]);

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16. What will be the output

console.log({} == {}); 
console.log({} === {});

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17. What will be the output

let x = 5;
let y = x++;
console.log(y);
console.log(x)

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18. What will be the output

let x = 5;
let y = ++x;
console.log(y);
console.log(x)

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19. What will be the output

console.log('apple'.split(''));

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20. What will be the output

const arr = [2,3,5,2,8,10,5];
console.log(arr.indexOf(5))

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21. What will be the output

const array = [8, 18, 28, 38];
const result = array.map(element => element + 2)
               .filter((element) => element > 25);
console.log(result);

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22. What will be the output

function checkValue(value){
    var result = Array.isArray(value);
    console.log(result);
}
checkValue([1,2,3]);

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23. What will be the output

function sum(a=5, b=7){
    return a+b;
}
console.log(sum(undefined, 20));

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24. What will be the output

console.log(10 + "5");
console.log("5" + 10);