Summary of common content added in ES6 + (II)

PiZriY 2021-08-08 18:39:22
summary common content added es6

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ES6+ New array method


Array Array.from(arrayLike[, mapFn[, thisArg]]) Convert a class array to an array
Parameters :
arrayLike An array of class
Optional parameters :
mapFn similar map Method , Return function when looping class array , The returned values form a new array
thisArg mapFn Function execution time this Point to
Return value
according to arrayLike New array generated
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 Boolean Array.isArray(data) Check whether the data is an array
Parameters :
data The data to be tested
Return value :
true Array ,false The array
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 Array Array.of(element0[, element1[, ...[, elementN]]]) Convert parameters to an array
Parameters :
elementN The data to be put into the array
Return value :
New array
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 Value arr.find(callback[, thisArg]) Find the value of the first element in the array that meets the requirements
Parameters :
Functions executed on each item of the array , receive 3 Parameters :
Currently traversed elements .
index[ Optional ]
Currently traversed index .
array[ Optional ]
The array itself
Optional parameters
Used for this The object of
Return value
The value of the first element in the array that satisfies the provided test function , Otherwise return to undefined
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Index arr.findIndex(callback[, thisArg]) Find the index of the value of the first element in the array that meets the requirements
Parameters :
For each element in the array , Will execute the callback function , The following three parameters will be automatically passed in during execution :
The current element .
Index of the current element .
call findIndex Array of .
Optional parameters :
perform callback Time as this The value of the object
Return value :
Index of values that meet the requirements
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Array arr.flat([depth]) Flatten multidimensional arrays
Optional parameters :
Specifies the depth of the structure to extract the nested array , The default value is 1.
Return value :
A new array containing all the elements in the array and subarray
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Array arr.flatMap(function callback(currentValue[, index[, array]]) {
// Returns the elements of the new array
}[, thisArg])
Method first uses the mapping function to map each element , Then compress the result into a new array .
It is associated with map and Depth value 1 Of flat Almost the same , but flatMap It's usually a little more efficient to merge into one method
Parameters :
Functions that can generate elements in a new array , You can pass in three parameters :
The elements currently being processed in the array
index Optional
Optional . The index of the current element being processed in the array .
array Optional
Optional . The called map Array
Optional parameters :
perform callback Function time The use of this value
Return value :
A new array containing all the elements in the array and subarray
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Array arr.fill(value[, start[, end]]);
Fill all elements of an array from the start index to the end index with a fixed value . Does not include terminating index
Parameters :
The value used to fill an array element .
Optional parameters :
Starting index , The default value is 0.
Terminate index , The default value is arr.length
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Boolean arr.includes(valueToFind[, fromIndex]) Determine whether the array contains a specified value
Parameters :
valueToFind The value you need to find
Optional parameters :
from fromIndex Start looking backwards at
Return value :
true Represents that the array contains valueToFind, false The representation array does not contain fromIndex
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ES6+ New string method


Boolean str.includes(valueToFind[, fromIndex])
Determines whether the string contains a specified value
detailed : Reference array includes
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Boolean str.endsWith(searchString[, length])
Determine whether the current string is in another given substring “ ending ”
Substring to search .
Optional parameters
As str The length of . The default value is str.length
Return value
Returns... If the passed in substring is at the end of the search string true; Otherwise it will return false.
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Boolean str.startsWith(searchString[, position])
Determines whether the current string starts with another given substring
Substring to search .
Optional parameters
stay str Mid search searchString The beginning of , The default value is 0, That's where the real string starts .
Return value
Returns... If the incoming substring is at the beginning of the search string true; Otherwise it will return false.
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String str.repeat(count)
Construct and return a new string , The string contains a specified number of copies of the string that are concatenated
Be situated between 0 And positive infinity . Represents how many times the original string has been repeated in the newly constructed string
Return value
New string generated
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