Compare performance of inlined try/catch vs try/catch extracted into a separate function

perf.js

function parse(json, defaultValue) {
	try {
		return JSON.parse(json);
	} catch (e) {
		return defaultValue;
	}
}

var json = JSON.stringify({a: 1, b: 2, c: 3, d: 4});

function mainSeparate() {
	var data = parse(json, {});

	var sum = 0;
	var keys = Object.keys(data);
	for (var i = 0, l = keys.length; i < l; i++) {
		sum = sum + data[keys[i]];
	}
}

function mainInline() {
	var data;

	try {
		data = JSON.parse(json);
	} catch (e) {
		data = {};
	}

	var sum = 0;
	var keys = Object.keys(data);
	for (var i = 0, l = keys.length; i < l; i++) {
		sum = sum + data[keys[i]];
	}
}

function perf(fn, iterations = 10000000) {
	var start = Date.now();
	for (var i = 0; i < iterations; i++) {
		fn();
	}

	var duration = Date.now() - start;
	console.log(`"${fn.name}()" duration: ${duration}ms`);
}

//perf(mainSeparate);
perf(mainInline);