Function prototype: Difference between revisions
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=={{header|JavaScript}}== |
=={{header|JavaScript}}== |
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JavaScript functions may also be used to define prototype objects |
ES5: JavaScript functions may also be used to define prototype objects |
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<lang JavaScript> |
<lang JavaScript> |
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// A prototype declaration for a function that does not require arguments |
// A prototype declaration for a function that does not require arguments |
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l.length; // 2 |
l.length; // 2 |
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</lang> |
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ES6: Class Declarations are used to define prototype objects |
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<lang JavaScript> |
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// A prototype declaration for a function that does not require arguments |
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class List { |
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push() { |
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return [].push.apply(this, arguments); |
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} |
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pop() { |
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return [].pop.call(this); |
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} |
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} |
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var l = new List(); |
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l.push(5); |
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l.length; // 1 |
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l[0]; 5 |
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l.pop(); // 5 |
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l.length; // 0 |
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// A prototype declaration for a function that utilizes varargs |
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class List { |
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constructor(...args) { |
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this.push(...args); |
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} |
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push() { |
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return [].push.apply(this, arguments); |
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} |
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pop() { |
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return [].pop.call(this); |
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} |
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} |
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var l = new List(5, 10, 15); |
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l.length; // 3 |
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l[0]; 5 |
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l.pop(); // 15 |
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l.length; // 2 |
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</lang> |
</lang> |
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