It’s all about javascript cool tips and tricks which help day to day programming and reduce the time of the developer. For more tricks you can also read Tips and Tricks.

1. Use == instead of ===

== only check Equality and === check Equality as well as type.

[1] === 1    // is false
[1]  == 1    // is true
'1' == 1     // is true
'1' === 1    // is false
 [] == 0     // is true
 [] === 0     // is false
 '' == false   // is true but true == "a" is false
 '' === false // is false 

2. undefined, null, 0, false, NaN, ” (empty string) are all falsy.

3. Empty an array

var arr = [1, 2, 3];  
arr.length = 0; // arr will be equal to [].

Read more: Javascript array

4. while loop power

var no = 4;
while (no--) console.log(no); // 3 2 1 0

Read more: Javascript loop

5. Iterate object in forEach

var obj = { name: "xyz", age: 23 };

[obj].forEach((val)=>{
	console.log(val); //{ name: "xyz", age: 23 }
});

Read more: Javascript loop

6. Power of join

var arr = ['one', 'two', 'three'];
var list = '<ul><li>' + arr.join('</li><li>') + '</li></ul>';

console.log(list);
//<ul><li>one</li><li>two</li><li>three</li></ul>

Read more: Javascript array

7. Create object clone

var obj = { 'name': 'xyz' };
var clone = Object.assign({}, obj);
clone.age = 23;
console.log(obj); // { 'name': 'xyz' };

8. Power of logical and/or

var bol = false;
bol || console.log(bol); // false

var bol = true;
bol && console.log(bol); // true

9. Power of Double negation

var no = 2;
console.log(no); // 2
console.log(!no); // false
console.log(!!no); // true boolean conversion of no value

// it’s just convert value into boolean form

10. toFixed is awesome

var no = 2.44567890;
no = no.toFixed(2);
console.log(no); // 2.45