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Testing which Array prototype methods work on NodeList
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| <!DOCTYPE HTML> | |
| <html> | |
| <head></head> | |
| <body> | |
| <h1>See Console for test results.</h1> | |
| <div id="testNode"> | |
| <i></i> | |
| <i></i> | |
| <i></i> | |
| <i></i> | |
| <i class="testClass"></i> | |
| </div> | |
| <script type="text/javascript"> | |
| // Calls apply on Array prototype methods, supplying the NodeList as a thisArg: | |
| function apply(testList, method, ...args) { | |
| return Array.prototype[method].apply(testList, args); | |
| } | |
| function test(method, ...args) { | |
| // Create NodeList for testing: | |
| const testList = document.body.querySelector("#testNode").querySelectorAll("i"); | |
| console.group(method + " results:"); | |
| try { | |
| console.log(apply(testList, method, ...args)); | |
| } catch (error) { | |
| console.error(error); | |
| }; | |
| console.groupEnd(); | |
| } | |
| test("pop"); | |
| // TypeError: Cannot assign to read only property 'length' of object '#<NodeList>' | |
| test("keys"); | |
| // Array Iterator {} | |
| test("slice", 0, 2); | |
| // (2) [i, i] | |
| test("indexOf", document.querySelector(".testClass")); | |
| // 4 | |
| test("find", node => node.className === "testClass"); | |
| // <i class="testClass"></i> | |
| test("join"); | |
| // [object HTMLElement],[object HTMLElement],[object HTMLElement],[object HTMLElement],[object HTMLElement] | |
| test("fill", "Hello", 0, 3); | |
| // TypeError: Failed to set an indexed property on 'NodeList': Index property setter is not supported. | |
| test("forEach", node => console.log(node)); | |
| // <i></i> <i></i> <i></i> <i></i> <i class="testClass"></i> | |
| test("filter", node => node.className === "testClass"); | |
| // [i.testClass] | |
| test("map", node => node.cloneNode()); | |
| // (5) [i, i, i, i, i.testClass] | |
| test("reverse"); | |
| // TypeError: Failed to set an indexed property on 'NodeList': Index property setter is not supported. | |
| test("some", node => node.className === "testClass"); | |
| // true | |
| test("every", node => node.tagName === "I"); | |
| // true | |
| </script> | |
| </body> | |
| </html> |
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