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It creates a brand new empty object, and then calls the function specified, with this set to that new object. Lets you modify an array by deleting a section and replacing it with more items.įunction Person ( first, last ) var s = new Person ( 'Simon', 'Willison' ) Prepends items to the start of the array.Ī.splice(start, delcount]]) Returns a new array with the items added on to it.Ĭonverts the array to a string - with values delimited by the sep paramĪ.unshift(item1]]) Returns a string with the toLocaleString() of each element separated by commas. Returns a string with the toString() of each element separated by commas.
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See also the full documentation for array methods. NumbersĪrrays come with a number of methods. Things are a lot easier if we stick with the first diagram, however, so we'll discuss the types listed there for now. So the type diagram looks more like this:Īnd there are some built-in Error types as well. And to be technically accurate, functions are just a special type of object. And Date and RegExp, which are objects that you get for free. And Array, which is a special kind of object. JavaScript programs manipulate values, and those values all belong to a type. Let's start off by looking at the building blocks of any language: the types. JavaScript also supports functional programming - because they are objects, functions may be stored in variables and passed around like any other object. JavaScript supports object-oriented programming with object prototypes, instead of classes (see more about prototypical inheritance and ES2015 classes).
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Its syntax is based on the Java and C languages - many structures from those languages apply to JavaScript as well. JavaScript is a multi-paradigm, dynamic language with types and operators, standard built-in objects, and methods.
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Many parts of the fourth edition formed the basis for ECMAScript edition 5, published in December of 2009, and for the 6th major edition of the standard, published in June of 2015. The fourth edition was abandoned, due to political differences concerning language complexity.
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The standard received a significant update as ECMAScript edition 3 in 1999, and it has stayed pretty much stable ever since. Several months after that, Netscape submitted JavaScript to Ecma International, a European standards organization, which resulted in the first edition of the ECMAScript standard that year. It was a mostly-compatible JavaScript work-alike. Several months later, Microsoft released JScript with Internet Explorer 3. This has been a source of confusion ever since.
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It was originally going to be called LiveScript, but it was renamed in an ill-fated marketing decision that attempted to capitalize on the popularity of Sun Microsystem's Java language - despite the two having very little in common. JavaScript was first released with Netscape 2 early in 1996. JavaScript was created in 1995 by Brendan Eich while he was an engineer at Netscape. It's useful to start with an overview of the language's history. JavaScript is now used by an incredible number of high-profile applications, showing that deeper knowledge of this technology is an important skill for any web or mobile developer. It is often derided as being a toy, but beneath its layer of deceptive simplicity, powerful language features await. Why a re-introduction? Because JavaScript is notorious for being misunderstood.