RunKit + npm: d3-polygon

var d3Polygon = require("d3-polygon") var unitSquare = [[0,0], [0,1], [1,1], [1,0]]; var polygonContains = d3Polygon.polygonContains; unitSquare.forEach( p => console.log(`[${p}] in unitSquare : ${polygonContains(unitSquare, p)}`));