time-to-botec

repl.txt (6420B)

---

 
 {{alias}}( collection, initial, [options,] reducer, done )
     Applies a function against an accumulator and each element in a collection
     and returns the accumulated result, iterating from right to left.
 
     When invoked, `reducer` is provided a maximum of five arguments:
 
     - `accumulator`: accumulated value
     - `value`: collection value
     - `index`: collection index
     - `collection`: the input collection
     - `next`: a callback to be invoked after processing a collection `value`
 
     The actual number of provided arguments depends on function length. If
     `reducer` accepts three arguments, `reducer` is provided:
 
     - `accumulator`
     - `value`
     - `next`
 
     If `reducer` accepts four arguments, `reducer` is provided:
 
     - `accumulator`
     - `value`
     - `index`
     - `next`
 
     For every other `reducer` signature, `reducer` is provided all five
     arguments.
 
     The `next` callback accepts two arguments:
 
     - `error`: error argument
     - `accumulator`: accumulated value
 
     If a provided function calls the `next` callback with a truthy `error`
     argument, the function suspends execution and immediately calls the `done`
     callback for subsequent `error` handling.
 
     Execution is *not* guaranteed to be asynchronous. To guarantee asynchrony,
     wrap the `done` callback in a function which either executes at the end of
     the current stack (e.g., `nextTick`) or during a subsequent turn of the
     event loop (e.g., `setImmediate`, `setTimeout`).
 
     The function does not support dynamic collection resizing.
 
     If provided an empty collection, the function invokes the `done` callback
     with the `initial` value as the second argument.
 
     The function does not skip `undefined` elements.
 
     When processing collection elements concurrently, *beware* of race
     conditions when updating an accumulator. This is especially true when an
     accumulator is a primitive (e.g., a number). In general, prefer object
     accumulators.
 
     Parameters
     ----------
     collection: Array|TypedArray|Object
         Input collection over which to iterate. If provided an object, the
         object must be array-like (excluding strings and functions).
 
     initial: any
         Accumulator value used in the first invocation of the reduction
         function.
 
     options: Object (optional)
         Function options.
 
     options.limit: integer (optional)
         Maximum number of pending invocations. Default: Infinity.
 
     options.series: boolean (optional)
         Boolean indicating whether to process each collection element
         sequentially. Default: true.
 
     options.thisArg: any (optional)
         Execution context.
 
     reducer: Function
         The function to invoke for each element in a collection.
 
     done: Function
         A callback invoked either upon processing all collection elements or
         upon encountering an error.
 
     Examples
     --------
     // Basic usage:
     > function fcn( acc, value, index, next ) {
     ...     setTimeout( onTimeout, value );
     ...     function onTimeout() {
     ...         console.log( value );
     ...         acc.sum += value;
     ...         next( null, acc );
     ...     }
     ... };
     > function done( error, acc ) {
     ...     if ( error ) {
     ...         throw error;
     ...     }
     ...     console.log( acc.sum );
     ... };
     > var arr = [ 1000, 2500, 3000 ];
     > var acc = { 'sum': 0 };
     > {{alias}}( arr, acc, fcn, done )
     3000
     2500
     1000
     6500
 
     // Limit number of concurrent invocations:
     > function fcn( acc, value, index, next ) {
     ...     setTimeout( onTimeout, value );
     ...     function onTimeout() {
     ...         console.log( value );
     ...         acc.sum += value;
     ...         next( null, acc );
     ...     }
     ... };
     > function done( error, acc ) {
     ...     if ( error ) {
     ...         throw error;
     ...     }
     ...     console.log( acc.sum );
     ... };
     > var opts = { 'limit': 2 };
     > var arr = [ 1000, 2500, 3000 ];
     > var acc = { 'sum': 0 };
     > {{alias}}( arr, acc, opts, fcn, done )
     2500
     3000
     1000
     6500
 
     // Process concurrently:
     > function fcn( acc, value, index, next ) {
     ...     setTimeout( onTimeout, value );
     ...     function onTimeout() {
     ...         console.log( value );
     ...         acc.sum += value;
     ...         next( null, acc );
     ...     }
     ... };
     > function done( error, acc ) {
     ...     if ( error ) {
     ...         throw error;
     ...     }
     ...     console.log( acc.sum );
     ... };
     > var opts = { 'series': false };
     > var arr = [ 1000, 2500, 3000 ];
     > var acc = { 'sum': 0 };
     > {{alias}}( arr, acc, opts, fcn, done )
     1000
     2500
     3000
     6500
 
 
 {{alias}}.factory( [options,] fcn )
     Returns a function which applies a function against an accumulator and each
     element in a collection and returns the accumulated result, iterating from
     right to left.
 
     Parameters
     ----------
     options: Object (optional)
         Function options.
 
     options.limit: integer (optional)
         Maximum number of pending invocations. Default: Infinity.
 
     options.series: boolean (optional)
         Boolean indicating whether to process each collection element
         sequentially. Default: true.
 
     options.thisArg: any (optional)
         Execution context.
 
     fcn: Function
         The function to invoke for each element in a collection.
 
     Returns
     -------
     out: Function
         A function which invokes a function for each element in a collection.
 
     Examples
     --------
     > function fcn( acc, value, index, next ) {
     ...     setTimeout( onTimeout, value );
     ...     function onTimeout() {
     ...         console.log( value );
     ...         acc.sum += value;
     ...         next( null, acc );
     ...     }
     ... };
     > var opts = { 'series': false };
     > var f = {{alias}}.factory( opts, fcn );
     > function done( error, acc ) {
     ...     if ( error ) {
     ...         throw error;
     ...     }
     ...     console.log( acc.sum );
     ... };
     > var arr = [ 1000, 2500, 3000 ];
     > var acc = { 'sum': 0 };
     > f( arr, acc, done )
     1000
     2500
     3000
     6500
     > acc = { 'sum': 0 };
     > arr = [ 1000, 1500, 2000 ];
     > f( arr, acc, done )
     1000
     1500
     2000
     4500
 
     See Also
     --------