d3/src/core/rebind.js at master · blehman/d3

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// Copies a variable number of methods from source to target.

d3.rebind = function(target, source) {

var i = 1, n = arguments.length, method;

while (++i < n) target[method = arguments[i]] = d3_rebind(target, source, source[method]);

return target;

};

// Method is assumed to be a standard D3 getter-setter:

// If passed with no arguments, gets the value.

// If passed with arguments, sets the value and returns the target.

function d3_rebind(target, source, method) {

return function() {

var value = method.apply(source, arguments);

return value === source ? target : value;

};

}