Introduction
In Javascript, functions are values ( first-class citizens ). This means that they can be assigned to a variable and/or pas...
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You should also tell about the
closureswhen talking about thehigher order functions. This is the concept most of the javascript developer use but never heard of it.I am working on a separate article about closures ;)
I thought it would be too long of an article if I tried to explain both things in the same post
Wow, Thanks for the nice simple explanation. Turns out I've been using this for years without giving it a name. Also been reading the term HoF for a while without bothering to lookup what it really was.
Excellent post. This helped a lot. I was wondering, what does the zero do here?:
The reduce function takes an optional second parameter that indicates the initial value. If I wanted to start counting from 10,that second parameter would have been 10. Here, I wanted to start counting from 0.
I believe you have set the variable n by mistake inside the for.
let array = [1, 2, 3, 4];let newArray = [];
for (let i = 0; i < array.length; i++) {
newArray[i] = array[i] * 2;
}
console.log(newArray);
// 2, 4, 6, 8
=============================
High Order Functions
let numbers = [1, 2, 3, 4];const result = numbers.map((n) => n * 2);
console.log(result);
// 2, 4, 6, 8
I believe you have set the variable n by mistake inside the for.
let array = [1, 2, 3, 4];let newArray = [];
for (let i = 0; i < array.length; i++) {
newArray[i] = array[i] * 2;
}
console.log(newArray);
// 2, 4, 6, 8
=============================
High Order Functions
let numbers = [1, 2, 3, 4];const result = numbers.map((n) => n * 2);
console.log(result);
// 2, 4, 6, 8
Sorry, but higher order functions and your example(I mean your example with grades, not first part with map) aren't linked at all. None of the functions from your example takes other functions as arguments or returns function as a result.
Of course, you use functions inside other functions and you pass results of other functions as arguments to other functions, but it is not a higher order function if we look at your definition above.
Good catch.
I believe you have set the variable n by mistake inside the for.
let array = [1, 2, 3, 4];
let newArray = [];
for (let i = 0; i < array.length; i++) {
newArray[i] = array[i] * 2;
}
console.log(newArray);
wow really awesome..this i learn clearly....
1.
Save a variable, time2p2. Assign as its value the result of invoking the timeFuncRuntime() function with the checkThatTwoPlusTwoEqualsFourAMillionTimes() function.
timeFuncRuntime() takes a function as an argument. The argument for timeFuncRuntime() is a callback function: timeFuncRuntime() has to actually call the callback function to see how long it takes to execute. Pass the checkThatTwoPlusTwoEqualsFourAMillionTimes() function as the argument for the timeFuncRuntime() function. Make sure to pass in the function without invoking it... What next to do?
Thank you so much, you really made it simple, easy, and full of great explanation and examples.....
You described it so plainly and simply that I found it very successful according to many articles I read on this subject. Thank you.
Very useful article
Thanks
So any function that Accept a function as an argument or return a function is an higher-order-function. Am I right?
Thank you!