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<!DOCTYPE html> <head> <meta charset="utf-8"> <script src="https://d3js.org/d3.v4.min.js"></script> <style> body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } </style> </head> <body> <script> // Feel free to change or delete any of the code you see in this editor! var svg = d3.select("body").append("svg") .attr("width", 960) .attr("height", 500) svg.append("text") .text("Edit the code below to change me!") .attr("y", 200) .attr("x", 120) .attr("font-size", 36) .attr("font-family", "monospace") isWithin = function (a, b){ //do something with Array.indexOf()? x = a.indexOf(b) if (x == -1) return false else return true } myArray = [4, 6, 20]; //some test data console.log(isWithin(myArray, 6)); //call function and print result </script> </body>
https://d3js.org/d3.v4.min.js