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A Array.length (Property) Array.length (Property) The number of elements in an array. Availability: ECMAScript edition 2 JavaScript 1.1 JScript 3.0 Internet Explorer 4.0 Netscape 3.0 Netscape Enterprise Server 2.0 Opera 3.0 Property/method value type: Number primitive JavaScript syntax: -myArray.length The length property of an array indicates one more than the maximum numeric index value that has currently been used. This is because Array elements start indexing from zero rather than one. Note that this is not necessarily a count of the exact number of elements in the array just an indication of its range of index values. Whenever a property is added whose name is an array index, the length property is recomputed to allow the length of the array to contain the new element that was added. Furthermore, when the length value is set explicitly, it may truncate the array and any properties whose names are numeric values that falls outside the bounds indicated by the length value will be deleted. This does only affect properties that belong to an Array object itself though. Any properties that are inherited from a parent or prototype are unaffected. The maximum value for an Array length is 4,294,967,295. This is because a 32 bit integer is used to index the array. Arrays of this length are unlikely to be encountered often! A web page containing an array of that size could take several weeks to download, that is assuming you had 4 GBytes of memory available and that your web browser could address that much storage. Although this property is marked as ReadOnly, there are some sub-classes of the Array object that allow you to modify the length property directly. Warnings: . The length property is so unreliable as to be virtually unusable unless you strictly constrain the way you add elements to the array. If you add elements to an array using associative names, the length property is not changed at all and will return a zero value. . If you then add an element to the array whose index is a numeric value, then the length property will be set to a value that is one more than the highest numbered numerically indexed item in the array. This following fragment of code yields an array length property value of 3: var myArray = new Array();myArray[2] = “ABC”;myArray[”zero”] = “ABC”;myArray[”one”] = “one”;myArray[”two”] = “two”;myArray[0] = “ABC”;
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JavaScript Programmer’s Reference Cross-references: ECMA 262 edition 2 section 15.4.4.3 ECMA 262 edition 3 section 15.4.4.5 “A” “B” “C” “D” Array instance 0 1 2 3 join string is “-” “A” “-” “B” “-” “C” “-” “D” “A-B-C-D” 100
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A Array.join() (Method) The result of this method will be a String primitive containing the array elements interposed with separators. The elements in the array are converted to strings and are concatenated together to form a larger string. Each element has the separator value placed between it and the next element. If the separator is not specified, then a single comma is used to join the array elements. This means that if you want no separation between the joined items you should pass an empty string as the separator value. Example code: See also: Array.prototype, Cast operator, String concatenate (+), String.split()
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JavaScript Programmer’s Reference When the String.match() method is used, it returns an array as a result. If the match used a pattern that made only a single match (that is, the g attribute was not used) then the array returned will have this additional index property. The indexproperty will contain the character location within the original string where the match occurred. See also: Array.input, RegExp.exec(), String.match() Array.input (Property) A special property provided only when the array results from a string match. Availability: JavaScript 1.2 JScript 5.5 Internet Explorer 5.5 Netscape 4.0 Property/method value type: String primitive JavaScript syntax: -myArray.input When the String.match() method is used, it returns an array as a result. If the match used a pattern that made only a single match (i.e. the g attribute was not used) then the array returned will have this additional input property. The inputproperty will contain a copy of the original string that was searched. See also: Array.index, RegExp.exec(), String.match() Array.join() (Method) Concatenate array elements to make a string. the array is concatenated to form a string Availability: ECMAScript edition 2 JavaScript 1.1 JScript 3.0 Internet Explorer 4.0 Netscape 3.0 Netscape Enterprise Server 2.0 Opera 3.0 Property/method value type: String primitive JavaScript syntax: -myArray.join(aSeparator) Argument list: aSeparator A string to place between array elements as
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A Array.constructor (Property) Array.constructor (Property) A reference to a constructor object. Availability: ECMAScript edition 2 JavaScript 1.1 JScript 3.0 Internet Explorer 4.0 Netscape 3.0 Property/method value type: Array constructor JavaScript syntax: -myArray.constructor The constructor is that of the built-in Array prototype object. You can use this as one way of creating arrays although it is more popular to use the new Array() technique. This property is useful if you have an object that you want to clone but you don’t know what sort of object it is. Simply access the constructor belonging to the object you have a reference to. Netscape provides constructors for many objects, virtually all of them in fact, even when it is highly inappropriate to do so. MSIE is far more selective and there are some occasions when you might wish for a constructor that MSIE does not make available. See also: Array.length, Array.prototype Cross-references: ECMA 262 edition 2 section 15.4.2 ECMA 262 edition 3 section 15.4.2 ECMA 262 edition 3 section 15.4.4.1 Array.index (Property) A special property provided only when the array results from a string match. Availability: JavaScript 1.2 JScript 5.5 Internet Explorer 5.5 Netscape 4.0 Property/method value type: Number primitive JavaScript syntax: -myArray.index
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JavaScript Programmer’s Reference for(myIndex = 0; myIndex < myLength; myIndex++) { document.write("“); document.write(myIndex); document.write(”“); document.write(anArray[myIndex]); document.write(”“); } document.write(”

“) } See also: Array.prototype, String.concat() Cross-references: ECMA 262 edition 3 section 15.4.4.4 Array instance Array instance 0 A 1 B 2 C 3 D A1.concat(A2) A1 A1 A2 Array instance 0 A 1 B 2 C 3 D
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A Array.concat() (Method) Array.concat() (Method) Concatenate arrays together. Availability: Property/method value type: JavaScript syntax: Argument list: The result of this method is a new array consisting of the original array, plus the concatenation. The values that are passed to the method are added to the end of the array. If arrays are passed, they are flattened and their individual elements added. The method returns an array consisting of the original Array plus the concatenated values. If Array1 contains “AAA”, “BBB”, “CCC” and Array2 contains “000″, “111″, “222″, then the method call Array1.concat(Array2) will return an array with all the elements in a single collection. The original arrays will be untouched. Warnings: . The concat() method will flatten arrays that are passed as arguments. However, it will not recursively flatten multi-dimensional arrays. Example code: ECMAScript edition 3 JavaScript 1.2 JScript 3.0 Internet Explorer 4.0 Netscape 4.0 Netscape Enterprise Server 3.0 Array object -myArray.concat(someValues, …) someValues A sequence of values to concatenate onto the array