JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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` ````
.container
h1 Math
b Let's generate a list of number between 0 and 5
p(var="list")
b Now, let's do the sum of this list
p(var="sum")
b We could also find the average of this list
p(var="average")
b ... and the median
p(var="median")
b But we can also do super cool things <br>
| such as predicting a logical sequence.
p Let's say we have a sequence of 3 numbers We can predict what would be the fourth number, and what is the function.
input(type="text" target="sequence" placeholder="3, 5, 7")
p(var="logic")
h2 Like what you see? Learn DisplayJS!
```

` ````
.container
text-align: center
```

` ````
// declaring init var
var $ = new DisplayJS(window);
var list = $.range(5)
var sum = $.sum(list)
var sequence = '3, 5, 7'
var logicSeq = [3, 5, 7]
array = {}
for(let i in $.range(logicSeq.length - 1)) {
array[parseInt(i) + 1] = logicSeq[i]
}
logic = $.predict(array, logicSeq.length + 1, true)
var average = $.average(list)
var median = $.median(list)
$.var()
$.target(function () {
logicSeq = eval(`[${sequence}]`)
array = {}
for(let i in $.range(logicSeq.length - 1)) {
array[parseInt(i) + 1] = logicSeq[i]
}
logic = $.predict(array, logicSeq.length + 1, true)
$.var()
})
```

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