JavaScript tutorial - array.prototype.flatMap()

Javascript Array flat() is an inbuilt method that creates a new array with all sub-array elements concatenated into it recursively up to the specified depth. It returns a new array with the sub-array elements concatenated into it.This tutorial covers array.prototype.flat() method. A multiple examples have been provided.

Javascript Array Flat Example

As its name suggests, the Array flat() method available on an Array prototype returns the new array that’s the flattened version of an array it was called on. If we do not provide arguments passed-in, then the depth of 1 is assumed.

This tutorial covers array.prototype.flatMap() method. This method is essentially a combination of map and flat methods. A multiple examples have been provided.

#javascript #array #prototype #flatmap #programming

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JavaScript tutorial - array.prototype.flatMap()
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#arrays #javascript #javascript arrays #javascript arrays tutorial

JavaScript tutorial - array.prototype.flatMap()

Javascript Array flat() is an inbuilt method that creates a new array with all sub-array elements concatenated into it recursively up to the specified depth. It returns a new array with the sub-array elements concatenated into it.This tutorial covers array.prototype.flat() method. A multiple examples have been provided.

Javascript Array Flat Example

As its name suggests, the Array flat() method available on an Array prototype returns the new array that’s the flattened version of an array it was called on. If we do not provide arguments passed-in, then the depth of 1 is assumed.

This tutorial covers array.prototype.flatMap() method. This method is essentially a combination of map and flat methods. A multiple examples have been provided.

#javascript #array #prototype #flatmap #programming

Javascript Array From Example | Array.prototype.from()

Javascript array from() is an inbuilt function that creates a new, shallow-copied array instance from an array-like object or iterable object.

The Array .from() lets you develop Arrays from the array-like objects (objects with a length property and indexed items) or  iterable objects ( objects where you can get its items, such as Map and  Set).

The Array from() function was introduced in ECMAScript 2015.

Javascript Array From Example

Array.from() method in Javascript is used to creates a new  array instance from a given array. If you pass a  string to the Array.from() function, then, in that case, every alphabet of the string is converted to an element of the new array instance. In the case of integer values, a new array instance simply takes the elements of the given Array.

The syntax of the Array.from() method is the following.

Syntax

Array.from(arrayLike[, mapFn[, thisArg]])

#javascript #ecmascript #javascript array from #array.prototype.from

Javascript Array FlatMap Example | JS Array flatMap()

Javascript Array flatMap() is an inbuilt method that maps each element using the map function, then flattens the result into the new array. It is identical to the Javascript Array  map followed by the Javascript Array  flat of depth 1, but the flatMap() method is often quite useful, as merging both into one method is slightly more efficient.

Javascript Array FlatMap Example

The array.flatMap() is an inbuilt Javascript function which is used to flatten the input array element into the new array. Array flatMap() first of all map every element with the help of mapping function, then flattens the input array element into the new array.

The syntax for flatMap() function is following.

let new_array = arr.flatMap(function callback(currentValue[, index[, array]]) {
    // return element for new_array
}[, thisArg])

It returns a new array with each element being the result of the callback function and flattened to a depth of 1. It has a callback function as a parameter that has the following arguments.

#javascript #array flatmap #js #flatmap

Javascript Array Shift Example | Array.prototype.shift()

Javascript array shift() is an inbuilt function that removes the first item from an array and returns that deleted item. The shift() method changes the length of the array on which we are calling the shift() method. Javascript Array Shift method is not  pure function as it directly modifies the  array.

Javascript Array Shift Example

Javascript shift() method removes the item at the zeroeth index and shifts the values at consecutive indexes down, then returns that removed value.

If we want to remove the last item of an array, use the  Javascript pop() method.

If the length property is 0,  undefined is returned.

The syntax for shift() method is the following.

array.shift()

An array element can be a  string, a number, an  array, a boolean, or any other  object types that are allowed in the Javascript array. Let us take a simple example.

#javascript #array.prototype.shift #javascript pop #javascript shift