Can Someone Explain This Line Of Code To Me - Programming

Can Someone Explain This Line Of Code To Me - Programming - Nairaland

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Can Someone Explain This Line Of Code To Me by BabyApple(op): 6:08pm On Sep 10, 2018

<!DOCTYPE html>
<html>
<body>

<h2>JavaScript Array Sort</h2>

<p>The highest number is <span id="demo"></span>.</p>

<script>
var points = [40, 100, 1, 5, 25, 10];
document.getElementById("demo" wink

.innerHTML = myArrayMax(points);

function myArrayMax(arr) {
return Math.max.apply(null, arr);
}
</script>

</body>
</html>

My question is where does (null, arr); comes from

Re: Can Someone Explain This Line Of Code To Me by codemarshal08(m): 7:03pm On Sep 10, 2018

BabyApple:
<!DOCTYPE html>
<html>
<body>

<h2>JavaScript Array Sort</h2>

<p>The highest number is <span id="demo"></span>.</p>

<script>
var points = [40, 100, 1, 5, 25, 10];
document.getElementById("demo".innerHTML = myArrayMax(points);

function myArrayMax(arr) {
return Math.max.apply(null, arr);
}
</script>

</body>
</html>

My question is where does (null, arr); comes from

null is built in Javascript . it is used to represent "nothing"
Javascript apply function accepts two (2) parameters. The first parameter is optional . passing null to it means no value.
The arr is used as a parameter in the myArrayMax function definition. parameters are used to pass data to a function.
In your code, the arr is used to pass the values in your point arrays to the myArrayMax function
parameters are defined by programmers.

3 Likes

Re: Can Someone Explain This Line Of Code To Me by fnep2smooth(m): 12:14am On Sep 11, 2018

BabyApple:
<!DOCTYPE html>
<html>
<body>

<h2>JavaScript Array Sort</h2>

<p>The highest number is <span id="demo"></span>.</p>

<script>
var points = [40, 100, 1, 5, 25, 10];
document.getElementById("demo".innerHTML = myArrayMax(points);

function myArrayMax(arr) {
return Math.max.apply(null, arr);
}
</script>

</body>
</html>

My question is where does (null, arr); comes from

You are simply telling the program to sort your number you listed in your array by showing the highest number.

1 Like

Re: Can Someone Explain This Line Of Code To Me by ogunjobiolaide: 3:37am On Sep 11, 2018

fnep2smooth:
You are simply telling the program to sort your number you listed in your array by showing the highest number.

You are on point

1 Like 1 Share

Re: Can Someone Explain This Line Of Code To Me by fnep2smooth(m): 6:17am On Sep 11, 2018

ogunjobiolaide:
You are on point

its our work o

Re: Can Someone Explain This Line Of Code To Me by BabyApple(op): 7:11am On Sep 11, 2018

codemarshal08:
null is built in Javascript . it is used to represent "nothing"
Javascript apply function accepts two (2) parameters. The first parameter is optional . passing null to it means no value.
The arr is used as a parameter in the myArrayMax function definition. parameters are used to pass data to a function.
In your code, the arr is used to pass the values in your point arrays to the myArrayMax function
parameters are defined by programmers.

what is the value of arr?

1 Like

Re: Can Someone Explain This Line Of Code To Me by codemarshal08(m): 8:44am On Sep 11, 2018

BabyApple:
what is the value of arr?

40, 100, 1, 5, 25, 10

View

Math.max.apply(null, arr);

Math.max.apply(40, 100, 1, 5, 25, 10)

1 Like

Re: Can Someone Explain This Line Of Code To Me by kaypompee: 3:21pm On Sep 11, 2018

The JS function returns the largest array value into a html span tag specified by the ID

1 Like

1 Reply

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