# JavaScript Fundamentals: While Loop, Break and Questions for Practice

## Day 7 of #100DaysOfCode

Today is the 7th day of my **#100DaysOfCode** journey with JavaScript.

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This Article is a part of the JavaScript Fundamentals series.

### While Loop

As long as the test condition evaluates to `true`

, the while statement generates a loop that performs the provided statement. Before the statement is carried out, the condition is assessed.

```
while(b > 7) {
// do something
}
```

We are just stating that if a condition is `true`

, this statement shall be carried out till it is not.👇🏼

**Example:** Complete the `top`

double function to find the largest double for the `value`

that is below the `top`

.

```
function topDouble(value, top) {
while (value < top) {
value = value*2;
}
return value/2;
}
```

### Break Statement

We will exit the loop once `break`

is hit. Even when the condition is `true`

, there is still a possibility to exit the loop thanks to the `break`

statement.

```
while(true) {
if(a > 5) {
// exit the loop
break;
}
}
```

### Questions for Practise

Given an integer value

**num**, determine if it is even. If it is even, return`true`

. Return`false`

otherwise.`function isEven(num) { if (num % 2 === 0){ return true; } } // or function isEven(num) { return num % 2 === 0; }`

The function

`smallerNumber`

will be given two unequal numbers:`num1`

and`num2`

. Your goal is to find the smaller number and return it!`function smallerNumber(num1, num2) { if (num1 < num2){ return num1; } else { return num2; } }`

A string is stored in the variable

`fakeName`

. Take this fake name and use it to replace every occurrence of`"John"`

in the`message`

. Do not change the message in other way.`const fakeName = require('./fakeName');`

`const message = ` Hello, John! You left a package at the office today. You can pick up tomorrow at 10am, John. If not I will drop it off this weekend. Goodbye John! `;`

`const fakeName = require('./fakeName'); const message = ` Hello, ${fakeName}! You left a package at the office today. You can pick up tomorrow at 10am, ${fakeName}. If not I will drop it off this weekend. Goodbye ${fakeName}! `;`

The function

`checkNumber`

takes a single argument: a number`num`

. The function should return the string`positive`

if the number is positive,`negative`

if the number is negative, and`zero`

if the number is zero.`function checkNumber(num) { if (num > 0){ return 'positive'; } else if(num < 0){ return 'negative'; } else { return 'zero'; } }`

The function

`maxSum`

takes a number argument`num`

. Your goal is find the sum all of numbers, starting from 1, up to and including`num`

.`function maxSum(num) { let sum = 0; for(let i=1; i<=num; i++){ sum = sum + i; } return sum; }`

### Conclusion

Ending with an extra bit of information about JavaScript functions...

We can exit loop by using both return and break statement.

**Today I learned about While Loop and Break Statement and also practiced a few Questions in JavaScript.**

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