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util/sample/js.txt

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+// Convert '-10px' to -10
+function px_to_int(pixels) {
+	if (typeof pixels != 'string') {
+		return 0;
+	}
+	var result = pixels.replace(/[^-0-9]/g, '');
+	if (result.length == 0) {
+		return 0;
+	} else {
+		return parseInt(result);
+	}
+}