Glossary Index

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153 terms
Array.prototype.fill()
The fill() method of Array instances changes all elements within a range of indices in an array to a static value.
Array.prototype.filter()
The filter() method of Array instances creates a shallow copy of a portion of a given array, filtered down to just the elements from the given array that pass the test implemented by the provided function.
Array.prototype.find()
The find() method of Array instances returns the first element in the provided array that satisfies the provided testing function.
Array.prototype.findIndex()
The findIndex() method of Array instances returns the index of the first element in an array that satisfies the provided testing function.
Array.prototype.findLast()
The findLast() method of Array instances iterates the array in reverse order and returns the value of the first element that satisfies the provided testing function.
Array.prototype.findLastIndex()
The findLastIndex() method of Array instances iterates the array in reverse order and returns the index of the first element that satisfies the provided testing function.
Array.prototype.flat()
The flat() method of Array instances creates a new array with all sub-array elements concatenated into it recursively up to the specified depth.
Array.prototype.flatMap()
The flatMap() method of Array instances returns a new array formed by applying a given callback function to each element of the array, and then flattening the result by one level.
Array.prototype.forEach()
The forEach() method of Array instances executes a provided function once for each array element.
Array.prototype.includes()
The includes() method of Array instances determines whether an array includes a certain value among its entries, returning true or false as appropriate.
Array.prototype.indexOf()
The indexOf() method of Array instances returns the first index at which a given element can be found in the array, or -1 if it is not present.
Array.prototype.join()
The join() method of Array instances returns a new string that is the concatenation of all elements in this array, separated by commas or a specified separator string.
Array.prototype.keys()
The keys() method of Array instances returns a new array iterator object that contains the keys for each index in the array.
Array.prototype.lastIndexOf()
The lastIndexOf() method of Array instances returns the last index at which a given element can be found in the array, or -1 if it is not present.
Array.prototype.map()
The map() method of Array instances creates a new array populated with the results of calling a provided function on every element in the calling array.
Array.prototype.pop()
The pop() method of Array instances removes the last element from an array and returns that element.
Array: length
The length data property of an Array instance represents the number of slots in that array.
ArrayBuffer
The ArrayBuffer object is used to represent a generic raw binary data buffer.
ArrayBuffer() constructor
Return value: A new ArrayBuffer object of the specified size, with its maxByteLength property set to the specified maxByteLength if one was specified.
ArrayBuffer.isView()
The ArrayBuffer.isView() static method determines whether the passed value is one of the ArrayBuffer views, such as typed array objects or a DataView.
ArrayBuffer.prototype.detached
The detached accessor property of ArrayBuffer instances returns a boolean indicating whether or not this buffer has been detached (transferred).
ArrayBuffer.prototype.maxByteLength
The maxByteLength accessor property of ArrayBuffer instances returns the maximum length (in bytes) that this array buffer can be resized to.
ArrayBuffer.prototype.slice()
The slice() method of ArrayBuffer instances returns a new ArrayBuffer whose contents are a copy of this ArrayBuffer's bytes from start, inclusive, up to end, exclusive.
ArrayBuffer.prototype.transfer()
The transfer() method of ArrayBuffer instances creates a new ArrayBuffer with the same byte content as this buffer, then detaches this buffer.
ArrayBuffer[Symbol.species]
The ArrayBuffer[Symbol.species] static accessor property returns the constructor used to construct return values from array buffer methods.
Array[Symbol.species]
The Array[Symbol.species] static accessor property returns the constructor used to construct return values from array methods.
array_column()
array_column() — Return the values from a single column in the input array.
array_combine()
array_combine() — Creates an array by using one array for keys and another for its values.
array_count_values()
array_count_values() — Counts the occurrences of each distinct value in an array.
array_diff()
array_diff() — Computes the difference of arrays.
array_filter()
array_filter() — Filters elements of an array using a callback function.
array_keys()
array_keys() — Return all the keys or a subset of the keys of an array.
array_map()
array_map() — Applies the callback to the elements of the given arrays.
array_reduce()
array_reduce() — Iteratively reduce the array to a single value using a callback function.
array_unique()
array_unique() — Removes duplicate values from an array.
Aspect ratio
An aspect ratio is the proportional relationship between an element or viewport's width and height.
AsyncFunction
The AsyncFunction object provides methods for async functions.
AsyncGenerator
The AsyncGenerator object is returned by an async generator function and it conforms to both the async iterable protocol and the async iterator protocol.
AsyncGenerator.prototype.return()
The return() method of AsyncGenerator instances acts as if a return statement is inserted in the generator's body at the current suspended position, which finishes the generator and allows the generator to perform any cleanup tasks when combined with a…
AsyncGenerator.prototype.throw()
The throw() method of AsyncGenerator instances acts as if a throw statement is inserted in the generator's body at the current suspended position, which informs the generator of an error condition and allows it to handle the error, or perform cleanup and…
At-Least-Once Delivery
A delivery guarantee that allows repeated delivery so a lost acknowledgement does not silently discard a message.