30:[{"id":"3ccff97fd2d93da734e76829b2b066eafdaac6a1fafdec0faf6ebc443271cfc109d29e80dd217468fcb2aff1e6bffdc73f356cc48feb657f35378e6abbbb63b9","href":"https://static.observableusercontent.com/files/3ccff97fd2d93da734e76829b2b066eafdaac6a1fafdec0faf6ebc443271cfc109d29e80dd217468fcb2aff1e6bffdc73f356cc48feb657f35378e6abbbb63b9","name":"aapl.csv","type":"text/csv","lastModified":1617209741493.466,"size":92399},{"id":"3ca44f93993f84575ab5461b4097d37b814438266e8cfe8774f70882f49bb289143c190963a158e8dc886989433af1161798ba76f2f4b36d17cc7150cba94477","href":"https://static.observableusercontent.com/files/3ca44f93993f84575ab5461b4097d37b814438266e8cfe8774f70882f49bb289143c190963a158e8dc886989433af1161798ba76f2f4b36d17cc7150cba94477","name":"goog.csv","type":"text/csv","lastModified":1617209741727.182,"size":93857},{"id":"51ef8c06edd5d139385ad9477c0a42cbf0152f5a4facf30a52d5eaa3ce4debecf1114c4a51199e734274e4411ec8149ffdd0d094cd334095cf8f2a004fc90d44","href":"https://static.observableusercontent.com/files/51ef8c06edd5d139385ad9477c0a42cbf0152f5a4facf30a52d5eaa3ce4debecf1114c4a51199e734274e4411ec8149ffdd0d094cd334095cf8f2a004fc90d44","name":"amzn.csv","type":"text/csv","lastModified":1617209741749.034,"size":94124},{"id":"c56b9e232d72bf1df96ca3eeca37e29e811adb72f49d943659a0006c015e74d2c429186d9dca251060784f364eb2a16fd39584695d523588bdcb87e4d9eac650","href":"https://static.observableusercontent.com/files/c56b9e232d72bf1df96ca3eeca37e29e811adb72f49d943659a0006c015e74d2c429186d9dca251060784f364eb2a16fd39584695d523588bdcb87e4d9eac650","name":"ibm.csv","type":"text/csv","lastModified":1617209741785.075,"size":93315}] 2e:{"title":"Select Transform / Observable Plot","cells":[{"id":0,"value":"

Select Transform / Observable Plot

Observable Plot › Transforms › Select · API

\n\n# Plot: Select\n\nThe select transform filters marks. It is similar to the basic [filter transform](/@observablehq/plot-transforms?collection=@observablehq/plot) except that it provides convenient shorthand for pulling a single value out of each series. The data are grouped into series using the *z*, *fill*, or *stroke* channel in the same fashion as the [area](/@observablehq/plot-area?collection=@observablehq/plot) and [line](/@observablehq/plot-line?collection=@observablehq/plot) marks.","pinned":false,"hidden":false,"mode":"md"},{"id":7,"value":"stocks = (await Promise.all([FileAttachment(\"aapl.csv\"), FileAttachment(\"amzn.csv\"), FileAttachment(\"goog.csv\"), FileAttachment(\"ibm.csv\")]\n .map(async file => [file.name.slice(0, -4).toUpperCase(), await file.csv({typed: \"true\"})])))\n .flatMap(([Symbol, data]) => data.map(d => ({Symbol, ...d})))","pinned":true,"hidden":false,"mode":"ojs"},{"id":16,"value":"Plot.plot({\n marginRight: 40,\n y: {\n grid: true,\n label: \"↑ Price ($)\"\n },\n marks: [\n Plot.line(stocks, {x: \"Date\", y: \"Close\", stroke: \"Symbol\"}),\n Plot.text(stocks, Plot.selectLast({x: \"Date\", y: \"Close\", z: \"Symbol\", text: \"Symbol\", textAnchor: \"start\", dx: 3}))\n ]\n})","pinned":true,"hidden":false,"mode":"ojs"},{"id":56,"value":"Next \nAPI Reference","pinned":false,"hidden":false,"mode":"md"}],"files":"$W30","stdlib":"1","titling":"auto"}