JavaScript API Disasters

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And How to Avoid Them

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★ Gimli

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[14, 3, 77] [14, 3] [77]

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var date = [14, 3, 77] var year = a.slice(2, 1) year [] date [14, 3, 77] var date = [14, 3, 77] var year = a.splice(2, 1) year [77] date [14, 3]

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https://twitter.com/AriyaHidayat/status/429111596627918848

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Readable, consistent, crystal clear

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X1.value = 'Rare'; X2.value = 'Medium'; X3.value = 'Well done'; Y.option = 'Fries'; Z.caption = 'Order'; X1.value = 'Rare'; X2.value = 'Medium'; X3.value = 'Well done'; Y.value = 'Fries'; Z.value = 'Order';

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slider.maxValue = 100; slider.minValue = 0; slider.value = 34; indicator.range = [100, 0]; indicator.progress = 61; slider.maximum = 100; slider.minimum = 0; slider.value = 34; indicator.maximum = 100; indicator.minimum = 0; indicator.value = 61;

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point.translate(14, -3) rect.translateBy(26, 4) point.translate(14, -3) rect.translate(26, 4)

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corner = new Point(10, 10); dim = new Size(70, 50); R = new Rect(corner, dim); Q = new Rect(10, 10, 80, 60); corner = new Point(10, 10); dim = new Size(70, 50); R = new Rect(corner, dim); Q = new Rect(10, 10, 70, 50); x1, y1, x2, y2 x, y, w, h

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var x = Math.sqrt(-2) isNaN(x) true x === NaN false isNaN('hola') true x == NaN false

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What’s in a name? that which we call a rose by any other name would smell as sweet...

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→

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event.initKeyEvent("keypress", true, true, null, null, false, false, false, false, 9, 0);

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// Horizontal s1 = new Slider(true); // Vertical s2 = new Slider(false); s1 = new Slider({ orientation: 'horizontal' }); s2 = new Slider({ orientation: 'vertical' });

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// Animate the resize w.resize(250, 150, true); // Do not animate the resize w.resize(250, 150, false); w.resize(250, 150, { animate: true });

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// Expand + animate treeItem.setState(true, true); // Expand + don't animate treeItem.setState(true, false); // Collapse + animate treeItem.setState(false, true);

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https://twitter.com/ID_AA_Carmack/status/367485612627984385

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X.disabled = false; Y.setHidden(true); filter.caseInsensitive = true; X.enabled = true; Y.setVisible(false); filter.caseSensitive = false;

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cube.translucency = 0.2; 20% translucent cube.opacity = 0.8; 80% opaque

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status.message("Ready"); page.forward(); page.backward(); status.showMessage("Ready"); page.goForward(); page.goBackward();

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picker.yearFrom = 1980; picker.yearTo = 2020; picker.minimumYear = 1980; picker.maximumYear = 2020;

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this.callMe = "Adam"; flight.from = SFO; flight.to = JFK; this.name = "Adam"; flight.departure = SFO; flight.destination = JFK;

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'sfjs-meetup'.substr(5, 6) "meetup" 'sfjs-meetup'.substr(6, 5) "eetup" 'sfjs-meetup'.substring(5, 6) "m" 'sfjs-meetup'.substring(6, 5) "m" 'sfjs-meetup'.slice(5, 6) "m" 'sfjs-meetup'.slice(6, 5) ""

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var a = [14, 3, 77] var b = a.slice(1, 2) a [14, 3, 77] b [3] var a = [14, 3, 77] var b = a.splice(1, 2) a [14] b [3, 77]

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var p = new Point(14, 3); p.translate(4, 4); var s = ' hal9000 '; s.trim();

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var p = new Point(14, 3); p.translate(4, 4); p.translated(4, 4); var s = ' hal9000 '; s.trim(); s.trimmed();