6 Cool Array Functions in ES6 You Must Know
6 ES6 Tricks That Make You Write Less And Do More.
1. Array.of
About the weird Array function:
As we all know, we can do the following things through the Array function.
- Initialize an array of the specified length
- Set the initial value of the array
The number of parameters passed to the Array function is not the same, and its function is not the same. This often confuses me.
Fortunately, we can use Array.of to make up for the shortcomings of Array.
2. Array.from
From the method, we can convert array-like objects, arguments objects, and NodeList objects into real arrays through Array.from the method.
- Array-like object
2. NodeList
3. Arguments
4. The second parameter of Array.from
We can use the Array.from method like “[].map”.
3. includes
We often write such judgment statements to do something when one of the conditions is met.
In fact, you can simplify the code through the include method.
4. Use the “at method” to read the tail element of an array
How do you read the tail element of the array? Yes, we need to read with “array.length-1” as a subscript.
Is there any other way?
Yes, the “at” method will be your magic. Of course, you can read elements elsewhere in the array.
5. flat
From MDN: “The flat() method creates a new array with all sub-array elements concatenated into it recursively up to the specified depth.”
6. findIndex
From MDN: “The findIndex() method returns the index of the first element in the array that satisfies the provided testing function. Otherwise, it returns -1, indicating that no element passed the test.”
Finally
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