qr code scanner java download JavaScript: A Beginner s Guide in Java

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JavaScript: A Beginner s Guide
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You set the first parameter to the index number at which you wish to begin adding elements For example, take a look at the following code:
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var fruits = new Array("oranges","apples","pears","grapes"); var somefruits = fruitssplice(2,0,"watermelons","plums");
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This time the addition of elements begins at index number 2, as specified in the first parameter, and nothing is removed, as specified in the second parameter Two elements are added, after which the array will have six elements (oranges, apples, watermelons, plums, pears, grapes)
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The sort() Method
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The sort() method sorts an array in alphabetical order (like a directory listing) This is not in numerical order, however As an example, consider the fruit array once again If you want to change the order of the elements so that they are in alphabetical order, you could use the following code:
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var fruits = new Array("oranges","apples","pears","grapes"); fruitssort();
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Among all the properties, are there any that are specifically useful for arrays The length property will come in handy in a number of cases The other properties are useful in certain situations (such as when needing to reverse the order of the array elements) You will likely find them useful in your own scripts as you progress Is there an easy way to remember all of these methods As with other lists, how well you remember them depends on how often you use the methods One helpful thing is to look for the pairs that complement each other, like pop() and push(), or shift() and unshift() So, the reverse() method just turns everything around backward Why would I want to do that You probably won t want to do it that often, but it can be helpful after using the sort() method to place a list of strings in reverse alphabetical order It can be helpful in a few other ways as well; it just depends on the data in the array So, the sort() method sorts the data in alphabetical order, but why does 70 come before 9 when this is sorted When the sort() method is used, it sorts using alphabetical order by default, meaning it converts all values to string values and then compares them In that case, anything that begins with 7 comes before anything that begins with 9, even if the numeric value of the former is higher
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11: JavaScript Arrays
This will reorder the array so that the elements will be in alphabetical order, changed from oranges, apples, pears, grapes to apples, grapes, oranges, pears You may find this useful when you want to display the contents of an array on a page You will see later in this chapter how to use loops to make the display of array contents easy
The toString Method
The toString() method combines the elements of an array into a single string with a comma as a separator character For example, you could use the following code:
var fruits = new Array("oranges","apples","pears","grapes"); var fruit_list = fruitstoString(); documentwrite(fruit_list);
This will write the string below to the document:
Oranges,apples,pears,grapes
Extended Array Methods
With JavaScript 16 or higher, there are some additional methods you can use Since (at the time of this writing) these are not currently cross-browser, these will only be listed and described in Table 11-3 For more information on these methods, see https://developermozillaorg/En/Core_ JavaScript_15_Reference:Global_Objects:Array (clicking one of the methods will give a more detailed description, often with code you can implement in order to use the same functionality in browsers that do not directly support the method)
Method
filter() forEach() every() indexOf() lastIndexOf() map() reduce() reduceRight() some()
Description
Returns a new array containing elements from an array that returned true based on the function used to filter it Calls a specified function for each element in the array Returns true if all elements in the array return true for the specified function used to test them Returns the lowest index number for an element that has a value equal to the specified value sent as a parameter Returns the highest index number for an element that has a value equal to the specified value sent as a parameter Returns a new array that results from calling a specified function on every element in the array Runs a function on two values in the array at a time, from left to right, until only a single value is left Runs a function on two values in the array at a time, from right to left, until only a single value is left Returns true if one or more elements return true for the specified function used to test them
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