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import constant from "./constant.js"; export default function(x) { var strength = constant(0.1), nodes, strengths, xz; if (typeof x !== "function") x = constant(x == null ? 0 : +x); function force(alpha) { for (var i = 0, n = nodes.length, node; i < n; ++i) { node = nodes[i], node.vx += (xz[i] - node.x) * strengths[i] * alpha; } } function initialize() { if (!nodes) return; var i, n = nodes.length; strengths = new Array(n); xz = new Array(n); for (i = 0; i < n; ++i) { strengths[i] = isNaN(xz[i] = +x(nodes[i], i, nodes)) ? 0 : +strength(nodes[i], i, nodes); } } force.initialize = function(_) { nodes = _; initialize(); }; force.strength = function(_) { return arguments.length ? (strength = typeof _ === "function" ? _ : constant(+_), initialize(), force) : strength; }; force.x = function(_) { return arguments.length ? (x = typeof _ === "function" ? _ : constant(+_), initialize(), force) : x; }; return force; }