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# Javascript floor: The Complete Guide

JavaScript floor() is the function used to return the largest integer value that is less than or equal to a number. Floor values are often required in various algorithm-building scenarios dealing with mathematical operations and can be directly seen in different mathematical formulae.

## Javascript floor

JavaScript floor() is a built-in math library function used to find the nearest integer less than the passed value(or equal to, if the given value is an integer). The floor() is a static method of Math, and it can be used without creating an object.

In other words, the floor() function rounds a number down and returns an integer value.

### Syntax

`Math.floor(x)`

### Parameters

The number whose floor value is to be calculated.

### Return Value

For integral values, returns the passed value.

For non-integral values, returns the nearest integer less than the passed value.

See the following figure.

#### Note

1. If no argument is passed, this method returns negative NaN.
2. If any of the arguments cannot be converted into a valid number, this method returns NaN.
3. If a parameter is null, this method returns 0.
4. If a parameter is an empty string, this method returns 0.
5. If a parameter is an empty array, this method returns 0.
6. This method returns the same value for Math.ceil(x) and -Math.floor(-x).

### Compatibility(Version and above)

2. Internet Explorer v3
3. Firefox v1
4. Edge v12
5. Opera
6. Safari v1
7. Android webview v1
8. Chrome for Android v18
9. Firefox for Android v4
10. Opera for Android
11. Safari on iOS v1
12. Samsung Internet v1.0
13. Node.js

JavaScript version: ECMAScript 1

Consider the following examples.

### example1.js

The following example demonstrates the use of this method.

```// example1.js

var a = 34.23;
var b = 32;

console.log(Math.floor(a));
console.log(Math.floor(b));
```

#### Output

```node example1
34
32
```

### example2.js

The following example demonstrates the case no argument is passed.

```// example2.js

console.log(Math.floor());
```

#### Output

```node example2
NaN
```

### example3.js

The following example demonstrates the cases where NaN is returned and cases where it can be avoided.

```// example3.js

var a = "JavaScript"; 	   // non-numeric string
var b = [1, 2, 3, 4];      // array with more than one element
var c;		           // undefined variable
var d = {};                // empty object

console.log(Math.floor(a));
console.log(Math.floor(b));
console.log(Math.floor(c));
console.log(Math.floor(d));

var e = "23.5";  		//numeric string
var f = [10.2]; 		//array with a single element

console.log(Math.floor(e));
console.log(Math.floor(f));
```

#### Output

```node example3
NaN
NaN
NaN
NaN
23
10
```

### example4.js

The following example demonstrates the cases where 0 is returned.

```// example4.js

var a = null;
var b = "";
var c = [];

console.log(Math.floor(a));
console.log(Math.floor(b));
console.log(Math.floor(c));
```

#### Output

```node example4
0
0
0
```

### example5.js

The following example demonstrates the case where a negative argument is passed.

```// example5.js

var a = -2.4;
var b = 2.4;

console.log(Math.floor(a));
console.log(Math.floor(b));
```

#### Output

```node example5
-3
2
```

### example6.js

The following example demonstrates that Math.ceil(x) returns same value as -Math.floor(-x).

```// example6.js

var x = 45.6;

console.log(Math.ceil(x));
console.log(-Math.floor(-x));
```

#### Output

```node example6
46
46
```

### example7.js

The following example demonstrates a scenario where the floor method can be used. Consider the following problem.

A startup has decided to hire new engineers to build their product. But they have a fixed budget. Given the fixed budget and the salary of an engineer, find out the maximum number of engineers the startup can hire.

```// example7.js

var budget;
var salary;

const rl = r.createInterface({
input: process.stdin,
output: process.stdout
});

const prompt1 = () => {
return new Promise((resolve, reject) => {
resolve();
});
});
};

const prompt2 = () => {
return new Promise((resolve, reject) => {
resolve();
});
});
};

const main = async () => {
await prompt1();
await prompt2();
rl.close();
console.log(Math.floor(budget / salary));
}

main();```

#### Output

```Test Case 1:
->node example7
Budget: 200000
Salary: 26000
7

Test Case 2:
->node example7
Budget: 250000
Salary: 100000
2```