If object is specified, copies all enumerable properties from the specified object into this map. The specified object may be an array. An optional key function may be specified to compute the key for each value in the array. For example:. Returns true if and only if this map has an entry for the specified key string. Note: the value may be null or undefined. Returns the value for the specified key string.
If the map does not have an entry for the specified key , returns undefined. Sets the value for the specified key string; returns the new value. If the map previously had an entry for the same key string, the old entry is replaced with the new value.
If the map has an entry for the specified key string, removes the entry and returns true. Otherwise, this method does nothing and returns false. Returns an array of string keys for every entry in this map. The order of the returned keys is arbitrary. Returns an array of values for every entry in this map. The order of the returned values is arbitrary. Returns an array of key-value objects for each entry in this map. The order of the returned entries is arbitrary. Calls the specified function for each entry in this map, passing the entry's key and value as two arguments.
The this context of the function is this map. Returns undefined. The iteration order is arbitrary. Constructs a new set. If array is specified, adds the given array of string values to the returned set. If the set contains the specified value string, removes it and returns true.
Returns an array of the string values in this set. Can be used as a convenient way of computing the unique values for a set of strings. Calls the specified function for each value in this set, passing the value as an argument.
The this context of the function is this set. Merges the specified arrays into a single array. This method is similar to the built-in array concat method; the only difference is that it is more convenient when you have an array of arrays.
This method is often used to iterate over a sequence of numeric or integer values, such as the indexes into an array. Unlike the Python version, the arguments are not required to be integers, though the results are more predictable if they are due to floating point precision. If step is omitted, it defaults to 1.
If start is omitted, it defaults to 0. The stop value is not included in the result. If the returned array would contain an infinite number of values, an error is thrown rather than causing an infinite loop. Returns a permutation of the specified array using the specified array of indexes.
The returned array contains the corresponding element in array for each index in indexes, in order. For example, permute ["a", "b", "c"], [1, 2, 0] returns ["b", "c", "a"].
It is acceptable for the array of indexes to be a different length from the array of elements, and for indexes to be duplicated or omitted. Add a comment. Active Oldest Votes. The API is clear about that: Returns an array containing the property names of the specified object. Improve this answer. Gerardo Furtado Gerardo Furtado I looked at MDN and d3 source code but you nailed what I was missing - "Array indexes are just enumerable properties with integer names.
Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Release Date. Finch Movie Review. Set in suburban Chicago in the late s, the story centers on ten-year-old Jake Doyle's Fegley herculean quest to get the latest and greatest video game system for Christmas.
The film is based on the novel by Kevin Jakubowski. The executive producers are Kevin Jakubowski and Whitney Brown. In Partnership with Wal-Mart. Table of Contents. The d3. Syntax: Hey geek!
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Now at it's lowest price ever! Return Value: It returns the keys of the given object. Below programs illustrate the d3. Skip to content.
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