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Hey, everyone, let's pick up from where we left in the previous video, we were going to start talking

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about incremental operators.

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So sometimes we just want to add values to a variable.

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So as an example, I'm going to create a variable called sales.

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So sales equals 20, for example.

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And now let's say I just want to add five.

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Let's say I'd just sold another item and I want to add it to the total sales so I could write it like

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this.

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So sales equals sales, which is now 20.

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And now I'm going to add five.

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So by doing this, we're adding five.

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Every time we do this.

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But there's also an easier way of doing this without repeating the name of the variable so we could

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write it like sales.

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Then use the incremental operator, which is plus equal and then five.

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And this is going to produce the same result.

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But this time we didn't have to repeat the name of the variable.

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But it's essentially the same thing that we wrote here.

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So the same way we can also use the minus equal.

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So now we are decreasing the value of the variable.

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And one cool thing about this incremental operator is that we can use it with strings.

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So let me just clear this.

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You fi have a variable called.

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First name or maybe the chooser like this.

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Name.

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Now, I have my name now.

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I can increment this variable by doing like this, so name.

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Plus equals.

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Now I'm going to add an empty space.

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Now I'm going to do it again.

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But this time I'm going to add my last name so we can keep doing this to add something to strings.

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So I just wanted to show you this.

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Now let's talk about type conversions.

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Sometimes we will have to do this.

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So in this example, let's say we received numbers as strings, this is very common sense signs.

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We're getting data from external sources and they just come as strings when we get data from inputs.

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This is also likely to happen.

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So when we have this that we just copy this.

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And pasted at the console like this.

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So now if I try to do first.

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No.

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Plus.

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Second number.

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What's happening here is that we have two strings.

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So what JavaScript does with the plus sign on strings is concatenation.

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So we're not making any sum here.

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We are just getting twenty one and concatenating it with four.

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These are strings.

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So in order to make this calculation with these kind of numbers, first, we need to convert them.

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So for that we can use the pass and or pass float.

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If you know you have only integer numbers you can just use the pass.

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And so repeating the operation instead of doing directly like this, I'm just going to use the.

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Boris.

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Int.

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So applying this to the first number.

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And the same thing for the second number.

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So pass.

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Int.

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So now we have the correct some because before doing the calculation, we are converting these strings

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to numbers.

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So the opposite is also true.

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So if you have an year of birth, for example, and this is a number and you just want to concatenate

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it with a string, you can use the two string method.

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So, again, this is a bit different.

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This could be a bit confusing.

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So in the first example, you're just right, pass it and put the variable name inside and to do the

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opposite.

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You just put the variable first and then dot to string.

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I know.

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I know this is confusing.

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Some people just hate JavaScript because of this.

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But don't worry about this now.

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This is just details, to be honest.

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I don't even memorize all these Fang's.

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I don't take space on my brain just to memorize that in case of string to integer.

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I have to do it like this when it's the opposite, when it's integer to string, I have to do it like

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this any anytime I want to confirm this, I have Google right in front of me so I can just type J.

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S string to integer and I will have the answer.

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So don't worry about this.

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If you know how to search for what you're trying to do, you will always have answers.

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Now, since we are talking about type conversions, just one thing to pay attention, you should always

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keep an eye on the type of your variables, because many times you won't notice that they are with the

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wrong types like this.

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Maybe we received the number.

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We do the calculation.

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We have an answer here and we think this is working, but we need to pay attention to see that.

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Oh, no, actually, this is not the correct sum.

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So always, always keep an eye on the types of your variables.

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All right.

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So now we are ready to move on.

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We're just going to talk quickly about two data types.

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So booleans and then no and undefined.

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And then we will do our first list of exercises where you were going to apply everything you learned

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so far.

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So I'll see you in the next video.