const obj1 = {a: 1, b: 2};
const obj2 = {c: 2, d:4, e:5};
Object.assign(obj2, obj1);
const result = Object.keys(obj2);
console.log(result)Output:
[ 'c', 'd', 'e', 'a', 'b' ]obj1 properties into obj2.( adding the properties from obj1 into obj2 directly.)obj1’s keys (a and b) are added to obj2, result includes all keys from both objects.const expr1 = (null <= 0);
const expr2 = ('' == false);
const result = (expr1 === expr2);
console.log(result)Output:
trueexpr1 = (null <= 0): In JavaScript, null is converted to ‘0’ when compared with number which makes null <= 0 evaluate to true.expr2 = ('' == false): The == operator performs type coercion. An empty string ('') is coerced to a number, which results in 0. Thus, '' == false evaluates to true because false is also coerced to 0.result = (expr1 === expr2): Since both expr1 and expr2 are true, the comparison true === true evaluates to true.const arr = [1, 2, '2', 3, 3, 4, 4, 5];
const result = [...new Set(arr)];
console.log(result);output:
[ 1, 2, '2', 3, 4, 5 ]arr using a Set, which only allows unique values.new Set(arr): Creates a new Set from the array. The Set will only keep unique values.[...new Set(arr)]: The spread operator ... is used to convert the Set back into an array.The output of console.log(’10’ – 5) is 5.
To find how many elements of an array fall between two values ‘a’ and ‘b’, we can use the ‘filter’ method. This method allows us to iterate over the array and apply a condition to each element, returning a new array with the elements that meet the condition. We can get the count of elements by using the length.
const array = [5, 10, 15, 20, 25, 30];
const a = 10;
const b = 25;
const newArray = array.filter(element => element >= a && element <= b);
const count = newArray.length;
console.log(newArray); // Output: [10, 15, 20, 25];
console.log(count); // Output: 4
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